Causes Of Blood In Urine: 10 Common And Serious Reasons 

Spotting blood in your urine can be a deeply unsettling experience. Whether it appears as a dramatic change in colour or is only picked up on a routine urine test, the presence of blood—known medically as haematuria—should never be dismissed. Sometimes the cause is straightforward and easy to treat, but on other occasions, it can be the first clue to a more serious underlying health issue.

Haematuria comes in two forms: macroscopic (or visible) haematuria, where the blood is obvious to the naked eye, and microscopic haematuria, where red blood cells are only detectable under a microscope. Both can be alarming, but they do not always signal the same thing. The most frequent culprit, particularly for visible blood, is a urinary tract infection (UTI), but a wide range of other conditions—some benign, others potentially life-threatening—can also be responsible.

Understanding the possible reasons behind blood in the urine is vital for anyone who experiences this symptom. In this article, you’ll discover the ten most common and important causes of haematuria, from everyday infections and kidney stones to cancers and rare systemic diseases. We’ll cover the key symptoms to look out for, risk factors that may increase your likelihood of certain conditions, and the crucial red flags that mean you should seek medical advice without delay.

If you’re concerned about blood in your urine, this guide aims to offer clear, practical information to help you navigate the next steps. As ever, an expert assessment is the safest way to get answers and peace of mind.

1. Urinary Tract Infections (UTIs)

Urinary tract infections are the single most common cause of visible blood in the urine. When bacteria enter and multiply within the urinary tract, they trigger inflammation of the bladder or kidneys that can damage tiny blood vessels, allowing red cells to leak into the urine. Although many UTIs are straightforward to treat, recognising the symptoms and seeking prompt care helps prevent complications—and reduces the risk of recurrent bleeding.

Definition and prevalence

A UTI occurs when bacteria colonise any part of the urinary system, from the urethra through to the bladder (cystitis) and up to the kidneys (pyelonephritis). Women are particularly susceptible, with around 5 in 10 experiencing at least one UTI in their lifetime, according to patient.info. Factors such as sexual activity, use of urinary catheters and anatomical differences all contribute to the higher incidence in women.

Symptoms and mechanism of bleeding

Typical signs of a UTI include:

• A burning or stinging sensation during urination
• An urgent or frequent need to pass urine
• Cloudy, dark or foul-smelling urine

As the bladder or kidney lining becomes inflamed, its delicate capillaries may rupture, causing either gross haematuria—where urine turns pink, red or brown—or microscopic haematuria detectable only under laboratory analysis.

Diagnosis and treatment

Initial assessment often involves a urine dipstick test to detect blood, nitrites and leukocyte esterase, followed by microscopy to confirm the presence of red and white blood cells. A midstream urine sample is cultured to identify the causative organism and its antibiotic sensitivities. First-line treatments typically include trimethoprim or nitrofurantoin, with non-prescription analgesics used to ease discomfort. In cases of pyelonephritis or recurrent UTIs, longer courses of antibiotics or alternative agents may be required.

Prevention and home care tips

Simple measures can reduce the risk of UTIs and associated bleeding:

• Stay well hydrated to flush bacteria from the urinary tract
• Void promptly after sexual intercourse to clear any introduced organisms
• Adopt gentle genital hygiene, wiping front to back

Although drinking plenty of water can help dilute urine and lower bacterial load, persistent or recurrent haematuria always warrants professional review. Cranberry products and probiotics are popular preventive options, but evidence remains mixed—so discuss these with your clinician before relying on them.

2. Kidney Stones

Kidney stones are hard, crystalline deposits that form within the kidneys from minerals and salts normally dissolved in urine. Over time, these crystals can grow into stones that vary in size—from a grain of sand to a golf ball—and can travel down the urinary tract. Their sharp edges often scrape the delicate lining of the ureter, triggering bleeding and pain.

What are kidney stones and who is affected?

Most stones consist of calcium oxalate, though other types include uric acid, struvite (infection-related) and cystine stones. Risk factors include dehydration, a diet high in salt and animal protein, obesity, and certain metabolic or genetic conditions. It’s estimated that roughly 1 in 10 people will develop a kidney stone at some point in their lives, with men affected slightly more often than women.

How kidney stones cause bleeding

As a stone passes from the kidney into the ureter, its jagged surface can abrade the urothelium—the thin tissue that lines the urinary tract. These tiny scratches allow red blood cells to leak into the urine, resulting in haematuria. Depending on the stone’s size and location, bleeding may be gross (visible) or microscopic.

Signs, symptoms, and when to seek help

The hallmark of kidney stones is sudden, severe pain—often described as “renal colic”—that typically begins in the flank and may radiate to the groin. Other symptoms can include:

• Nausea and vomiting
• Restlessness or inability to find a comfortable position
• Visible pink, red or brown urine
• Urinary urgency or frequency if a stone lodges near the bladder

If you experience excruciating pain, fever, chills, or an inability to pass urine, these are red flags that require urgent medical attention.

Treatment options and dietary advice

Most small stones pass on their own with supportive measures. Pain relief with non-steroidal anti-inflammatory drugs (NSAIDs) is first-line, and alpha-blockers (such as tamsulosin) may be prescribed to relax the ureter and encourage stone passage. Patients who have large stones, obstructive uropathy or recurrent infections often need urological intervention—ranging from extracorporeal shock wave lithotripsy (ESWL) to ureteroscopy or percutaneous nephrolithotomy.

Dietary changes can reduce the risk of future stones:

• Drink plenty of fluids—aim for 2–3 litres a day of water
• Limit salt and animal-protein intake
• Moderate high-oxalate foods (spinach, nuts, tea) if you form calcium oxalate stones
• Maintain a healthy body weight and discuss supplements (such as citrate) with your clinician

By combining effective pain management, timely referral for intervention and long-term dietary adjustments, most people can avoid the worst consequences of kidney stones and minimise the chance of recurrence.

3. Enlarged Prostate (Benign Prostatic Hyperplasia)

As men get older, the prostate gland often grows in size—a condition known as benign prostatic hyperplasia (BPH). Although BPH is non-cancerous, its gradual enlargement can press on the urethra and bladder, leading not only to classic urinary symptoms but also to bleeding. Fragile, newly formed blood vessels in the overgrown prostate may rupture, allowing red blood cells to enter the urine.

What is benign prostatic hyperplasia?

Benign prostatic hyperplasia is an age-related change in which prostate cells multiply, causing the gland to swell. The prostate surrounds the urethra just below the bladder, so any increase in gland volume can impede urine flow. BPH typically begins in men over 50 and becomes more common with each passing decade. While “benign” indicates that it is not cancerous, its effects on urination can significantly affect quality of life.

How BPH leads to haematuria

As the prostate expands, it can create pockets of weak, superficial blood vessels in the gland’s lining. Everyday activities—such as straining to pass urine or a sudden increase in bladder pressure—can tear these delicate vessels. The result may be intermittent spotting of blood (gross haematuria) or blood cells detected under the microscope (microscopic haematuria). In many cases, bleeding is painless but always warrants investigation.

Symptoms and risk factors

Men with BPH often report lower urinary tract symptoms (LUTS) such as:

• Hesitancy or difficulty starting urination
• A weak or interrupted urine stream
• Increased frequency, especially at night (nocturia)
• A lingering feeling of incomplete bladder emptying

Risk factors for BPH include:

• Age (most common in men aged 50 and above)
• Family history of enlarged prostate
• Lifestyle factors, such as obesity and lack of physical activity

While BPH itself isn’t life-threatening, its symptoms can worsen over time and may lead to complications like urinary retention or recurrent urinary tract infections.

Diagnosis and treatment pathways

Assessment usually begins with a digital rectal examination (DRE) to gauge prostate size and consistency. Additional tests can include:

• Prostate-specific antigen (PSA) blood test to rule out cancer
• Uroflowmetry to measure the strength and volume of urine flow
• Ultrasound imaging to visualise prostate and bladder post-void residue

First-line medical treatments aim to relax smooth muscle and shrink prostate tissue. These include alpha-blockers and 5-alpha-reductase inhibitors (spirehealthcare.com), which can improve symptoms and reduce the risk of bleeding. Men unresponsive to medication or those with severe obstruction may be offered surgical options such as transurethral resection of the prostate (TURP) or laser enucleation. Each approach carries its own risks and benefits, so patients should discuss the options with their urologist to find the most suitable plan.

4. Bladder Cancer

Visible blood in the urine is often the first—and sometimes only—sign of bladder cancer. Tumours arising from the lining of the bladder (urothelium) tend to form fragile, abnormal blood vessels. As these lesions grow or are rubbed by passing urine, they can ooze or bleed intermittently, leading to episodes of haematuria that may come and go without warning.

How bladder cancer causes blood in urine

Bladder tumours are highly vascular, meaning they develop networks of new blood vessels to feed their rapid growth. These vessels lack the structural integrity of normal vasculature, so they rupture easily. Even minor bladder contractions or the passage of urine can abrade the tumour surface, allowing red cells to spill into the urinary stream. Because the bleeding is often painless and intermittent, patients may dismiss it until the next attack of frank haematuria.

Key risk factors according to Cancer Research UK

Several factors increase the likelihood of developing bladder cancer. According to Cancer Research UK, the most important include:

• Smoking: The single biggest risk—smokers are up to four times more likely to develop bladder cancer than non-smokers.
• Occupational exposures: Aromatic amines and dyes used in the rubber, textile and chemical industries can accumulate in the bladder lining.
• Chronic catheter use: Long-term indwelling catheters may irritate the bladder mucosa.
• Pelvic radiotherapy: Previous radiation for prostate, cervical or rectal cancers can damage bladder tissue.
• Family history and genetic factors: A small proportion of cases cluster in families, suggesting inherited susceptibility.

Understanding these risks helps clinicians target surveillance and encourages patients to modify lifestyle factors—particularly smoking cessation.

Symptoms beyond haematuria

While blood in the urine is the hallmark, bladder cancer may also present with:

• Increased urinary frequency and urgency
• Pain or a burning sensation during voiding (dysuria)
• A sensation of incomplete bladder emptying
• Pelvic discomfort in later stages

It’s worth noting that some patients remain entirely asymptomatic aside from episodic bleeding. Any unexplained, painless haematuria should therefore prompt further investigation.

Diagnostic steps and referral guidelines

When bladder cancer is suspected, a structured diagnostic approach ensures early detection:

1. Urinalysis and urine cytology: Initial tests to confirm haematuria and detect atypical cells.
2. Cystoscopy with biopsy: The gold-standard procedure. A flexible or rigid cystoscope allows direct visualisation of the bladder lining and targeted sampling of suspicious lesions.
3. Imaging: CT urogram or ultrasound can evaluate the upper urinary tract (kidneys and ureters) and assess the extent of any mass.

In the UK, the NICE NG12 guideline recommends an urgent suspected-cancer referral for any person aged 45 or over with unexplained visible haematuria, or any age with recurrent or persistent visible haematuria accompanied by irritative urinary symptoms or a raised white cell count on dipstick testing. Early referral and prompt cystoscopic assessment are crucial for improving outcomes.

5. Kidney Cancer

Kidney cancer arises from the renal parenchyma, most commonly as renal cell carcinoma. Although incidental detection on imaging is increasingly frequent, classic presentations still include flank pain, weight loss and blood in the urine. Early recognition of haematuria can prompt timely investigation and improve outcomes.

Overview of kidney cancer and its symptoms

Many patients with early kidney cancer remain asymptomatic, but when symptoms do occur they often include:

• Flank or abdominal pain that does not resolve
• An unusual lump or mass felt in the side or back
• Unexplained weight loss, night sweats or fever
• Fatigue and reduced appetite

Occasionally, kidney tumours produce excess erythropoietin, leading to raised red-cell counts and associated headaches or dizziness.

Why haematuria occurs in kidney cancer

As a tumour grows within the kidney, it may invade into the collecting system—the network of calyces and pelvis that drains urine into the ureter. Fragile, newly formed vessels within the tumour wall can rupture, allowing blood to mix with urine. Haematuria may be intermittent and painless, which can delay presentation until the bleeding becomes more obvious or other symptoms emerge.

NICE NG12 referral criteria for visible haematuria

According to the NICE NG12 guideline, any adult aged 45 or over with unexplained visible haematuria should be referred urgently under a suspected-cancer pathway. Early referral ensures that patients undergo appropriate imaging without delay, as prompt diagnosis is crucial for curative treatment.

Typical diagnostic investigations

When kidney cancer is suspected, a structured approach to imaging and assessment is adopted:

• Contrast-enhanced CT scan (CT urogram) to visualise the size, location and vascular supply of a renal mass.
• MRI for patients with contraindications to iodinated contrast or when more detailed soft-tissue characterisation is required.
• Ultrasound may be used as an initial test in patients with contraindications to CT, though it is less sensitive for small lesions.
• Percutaneous renal biopsy in selected cases to obtain histological confirmation prior to planning ablative or surgical therapy.

These investigations guide treatment decisions, whether that be partial nephrectomy, radical nephrectomy or less invasive ablative techniques, and help determine prognosis by staging the disease.

6. Prostate Cancer

Prostate cancer is a malignant growth within the prostate gland that can, in later stages, encroach upon the urinary system. While many early prostate tumours remain confined and asymptomatic, progressive disease may invade the urethra or bladder neck, leading to bleeding. Given its prevalence—affecting around one in eight men during their lifetime—understanding how prostate cancer contributes to haematuria is crucial for prompt diagnosis and management.

How prostate cancer affects the urinary tract

As a tumour expands, it can infiltrate the tissues lining the urethra or the bladder outlet. This invasion disrupts the normal mucosa and often erodes fragile, newly formed blood vessels. The result may be intermittent or persistent blood in the urine, which sometimes coexists with other obstructive symptoms.

Other symptoms and risk factors for prostate cancer

Beyond haematuria, prostate cancer may present with:

• Lower urinary tract symptoms: Hesitancy, a weak or interrupted stream, increased frequency or nocturia—symptoms that can mimic benign prostatic enlargement.
• Raised PSA: Elevated prostate-specific antigen levels on a blood test often prompt further evaluation.
• Systemic or metastatic signs: Bone pain (especially in the spine or pelvis), unexplained weight loss or persistent fatigue can indicate advanced disease.

Key risk factors include advancing age (most diagnoses occur after 50), a family history of prostate cancer, and African or Caribbean heritage, which is associated with both higher incidence and more aggressive tumours.

Diagnostic process (PSA, imaging, biopsy)

Investigation typically begins with a clinical examination and PSA measurement. If PSA levels are raised or a digital rectal examination feels suspicious, multiparametric MRI of the prostate is the next step. MRI can pinpoint areas of concern, guiding targeted biopsies performed either transrectally or via a transperineal approach. These tissue samples provide definitive confirmation of malignancy, grading the cancer’s aggressiveness and informing treatment decisions.

Management and treatment options

Treatment is individualised according to disease stage, patient health and personal preference. Common strategies include:

• Active surveillance: Regular monitoring with PSA tests, MRI scans and repeat biopsies for low-risk, slow-growing cancers.
• Radical prostatectomy: Surgical removal of the prostate gland, often using minimally invasive or robotic techniques to reduce recovery time and side effects.
• Radiotherapy: External beam radiation or internal brachytherapy (radioactive seed implants) targeted at the prostate.
• Androgen deprivation therapy: Hormonal treatments that lower testosterone levels, used in advanced or recurrent cases.

A thorough discussion of potential benefits and side effects—such as urinary incontinence or erectile dysfunction—is essential when choosing the most appropriate treatment pathway.

7. Glomerulonephritis

Glomerulonephritis refers to inflammation of the kidney’s filtration units—the glomeruli. When these tiny capillary networks become damaged, they allow red blood cells and proteins to escape into the urine. Although the condition varies in severity and cause, identifying it promptly is vital to prevent long-term kidney damage.

Understanding glomerulonephritis and its causes

Glomerulonephritis can be classified as primary—originating in the kidney itself—or secondary, where another disease triggers inflammation. Common primary forms include IgA nephropathy, characterised by deposits of immunoglobulin A in the glomeruli. Secondary causes range from systemic conditions such as lupus erythematosus and vasculitis to infections like post-streptococcal glomerulonephritis. In each case, the underlying trigger sets off an immune response that injures the delicate filtration barrier.

Mechanism of blood leakage in glomerulonephritis

In a healthy kidney, glomerular capillaries are tightly sealed, preventing blood cells from passing into the urinary filtrate. In glomerulonephritis, an inflammatory process disrupts these barriers. Swollen or scarred capillary walls develop gaps through which red blood cells can slip, resulting in microscopic—or sometimes visible—haematuria. Proteinuria often accompanies this leakage, producing foamy urine and signalling significant glomerular injury.

Common presentations and risk factors

Glomerulonephritis often shows up on routine urine tests as microscopic blood and protein, even when you feel well. Other clues may include:

• Swelling of the ankles, face or hands (oedema)
• High blood pressure, sometimes sudden in onset
• Reduced urine output or dark-coloured urine

Children and young adults are particularly prone to certain types, such as post-streptococcal or IgA nephropathy, but adults with autoimmune disorders or persistent infections may also be affected. A family history of kidney disease and conditions like diabetes can raise the risk.

Treatment approaches and prognosis

Management hinges on tackling both inflammation and its consequences:

• Immunosuppressive therapy: Corticosteroids and agents such as cyclophosphamide may be prescribed to quiet an overactive immune attack.
• Blood pressure control: ACE inhibitors or angiotensin receptor blockers help reduce intraglomerular pressure, protect remaining kidney function and limit protein loss.
• Supportive measures: Salt and fluid restrictions manage oedema; diuretics may be needed in more severe cases.

With early intervention, many patients achieve remission or stabilisation of kidney function. However, prolonged inflammation can lead to scarring (glomerulosclerosis) and chronic kidney disease, so regular monitoring—both of blood pressure and kidney function—is essential. If you notice signs of swelling, persistent changes in urine appearance or newly diagnosed hypertension alongside haematuria, a specialist assessment is recommended.

8. Urinary Tract Injury

Any direct damage to the kidneys, ureters, bladder or urethra can cause blood to appear in your urine. Injuries range from major accidents—like a road-traffic collision—to everyday strains in sport. In each case, the impact may disrupt blood vessels and allow red cells to leak into the urinary stream. Even if the initial injury seems minor, bleeding can persist or recur, so it’s important to understand the mechanisms, recognise warning signs and know when to seek further assessment.

Types of urinary tract injuries

Trauma can be classified as:

• Blunt injury: Common after falls, car crashes or heavy blows to the flank. The force can bruise or rupture renal tissue, leading to immediate or delayed haematuria.
• Penetrating injury: Stabbings, gunshot wounds or fractured bone fragments can lacerate the bladder or kidney. Such injuries often produce visible blood and may be accompanied by other signs of internal damage.

Each type carries its own risks. Blunt trauma can cause kidney contusions or a perirenal haematoma, while penetrating wounds may require surgical repair. No matter the mechanism, any gross haematuria following trauma should prompt a medical evaluation.

Exercise-induced haematuria and mechanism

Surprisingly, vigorous exercise—especially long-distance running or high-impact sports—can also cause transient bleeding. During prolonged activity, the bladder wall may undergo repeated micro-trauma as it repeatedly fills and empties, or the kidneys may suffer temporary alterations in blood flow. The result is microscopic or even visible haematuria that typically resolves within 24–48 hours of rest. While often benign, exercise-induced bleeding should still be monitored, and any persistent or severe cases investigated.

Symptoms and initial management

Whether from trauma or exertion, urinary tract injury often presents with:

• Gross haematuria: Bright red or cola-coloured urine.
• Flank or pelvic pain: A constant ache or sharp twinges at the injury site.
• Signs of systemic impact: Dizziness, weakness or rapid heart rate if bleeding is significant.

Initial steps include:

1. Rest and avoid strenuous activity.
2. Drink plenty of fluids to keep urine flowing.
3. Hold off on NSAIDs until a clinician rules out internal injury—these can worsen bleeding.

If pain is severe, or if you develop symptoms of shock (lightheadedness, clammy skin), seek urgent care.

When to seek medical assessment

Most minor cases settle quickly, but you should arrange professional review if:

• Bleeding continues beyond 48 hours.
• You experience increasing pain, swelling or bruising in the flank.
• There are signs of blood loss—dizziness, fainting or a rapid pulse.
• You notice any difficulty passing urine or signs of infection (fever, chills).

Persistent haematuria after an injury, even if it seems to improve, may mask underlying complications such as a collecting-system tear or evolving haematoma. An urgent imaging study—often an ultrasound or CT scan—is essential to rule out significant damage.

9. Sickle Cell Disease

Sickle cell disease is an inherited blood disorder in which abnormal haemoglobin causes red blood cells to assume a sickle shape. These misshapen cells can obstruct small blood vessels throughout the body, including those in the kidneys. When blood supply to the renal papillae—tiny projections in the inner part of the kidney—is compromised, tissue can die (papillary necrosis), leading to episodes of haematuria.

How sickle cell disease leads to haematuria

Within the kidney’s medulla, blood vessels are narrow and sensitive to low oxygen levels. Sickled cells tend to clump together and block these vessels, causing ischaemia (reduced blood flow) and infarction of papillary tissue. As the damaged papillae slough off, they can bleed into the collecting system. The result is often episodic, sometimes dramatic, visible blood in the urine.

Prevalence and affected demographics

Sickle cell disease most commonly affects people whose ancestors come from regions where malaria was endemic—primarily parts of sub-Saharan Africa, the Mediterranean, the Middle East and India. In the UK, sickle cell disease is the most prevalent genetic disorder among people of African and Caribbean descent. Around 1 in 2,000 babies in England is born with a form of the condition.

Symptoms and complications

Haematuria in sickle cell disease tends to occur in adolescence or adulthood, often presenting as a sudden onset of cola-coloured or bright red urine. It can be accompanied by:

• Flank or lower back pain, reflecting papillary sloughing
• Episodic crises of pain elsewhere in the body, due to widespread vaso-occlusion
• Signs of chronic kidney damage—such as reduced concentrating ability leading to nocturia

Repeated papillary necrosis and ongoing vascular injury may contribute to progressive loss of renal function, sometimes culminating in chronic kidney disease.

Management strategies and monitoring

Treatment focuses on reducing sickling episodes, protecting kidney health and managing acute bleeding:

• Hydration: Maintaining good fluid intake helps lower blood viscosity and reduces the risk of vaso-occlusive crises.
• Hydroxyurea therapy: This medication stimulates production of fetal haemoglobin, which interferes with sickling and can decrease the frequency of haematuric episodes.
• Pain management: Analgesics—ranging from paracetamol to stronger opioids—are used during acute crises.
• Regular renal assessment: Periodic blood tests (eGFR, creatinine) and urine analyses detect early changes in kidney function.

Referral to a haematologist and a nephrologist ensures a coordinated plan, balancing strategies to prevent sickling with measures to preserve long-term renal health.

10. Certain Medications

Medications can occasionally be the culprit behind haematuria. Some drugs either thin the blood—making spontaneous bleeding more likely—or irritate the lining of the urinary tract directly. While this side effect is uncommon, recognising a temporal link between starting a new medication and the appearance of blood in your urine can save time and prompt a swift course of action.

Drugs commonly linked to haematuria

• Anticoagulants and antiplatelets: Warfarin, direct oral anticoagulants (DOACs), aspirin and clopidogrel can disrupt normal clotting pathways, increasing the risk of bleeding anywhere in the body, including the urinary tract.
• Nonsteroidal anti-inflammatory drugs (NSAIDs): Prolonged or high-dose NSAID use may cause renal papillary damage or irritate the bladder lining.
• Cyclophosphamide: This chemotherapy agent and immunosuppressant can inflame the bladder (haemorrhagic cystitis) if adequate hydration and bladder protection measures are not observed. See more on managing bladder pain.
• Certain antibiotics: Penicillins and sulfonamides have been occasionally associated with bleeding, either via hypersensitivity reactions or direct mucosal irritation.

How medications can cause bleeding in urine

Drugs affect urinary bleeding through two main mechanisms:

1. Impaired clotting
   Anticoagulants and antiplatelets interfere with platelet function or clotting factor production. Even minor vessel damage within the kidneys or bladder mucosa can lead to visible haematuria when the body’s normal ability to form a clot is reduced.
2. Direct mucosal irritation
   Some medications or their metabolites concentrate in urine and irritate the lining of the bladder or urethra. Over time, this irritation can inflame capillaries and cause them to leak.

Identifying and reporting side effects

If you notice blood in your urine soon after beginning a new drug, consider these steps:

• Check the timeline: Note when the medication was started and when haematuria first appeared.
• Review dosage and duration: Bleeding risk often correlates with dose and length of therapy.
• Assess other symptoms: Look for bladder discomfort, pain or urinary frequency that may indicate mucosal irritation.
• Document clearly: Record the colour of your urine and any associated signs (for example, bruising, nosebleeds or unusual fatigue).

Always report suspected drug-related haematuria to your prescribing clinician. They may advise dosage adjustment, temporary suspension or substitution with an alternative agent.

What to do if haematuria occurs after starting a new medication

While bleeding linked to a medication does not always signal a serious problem, it should never be ignored:

1. Seek medical advice
   Contact your doctor or pharmacist promptly. Do not stop essential medications—particularly anticoagulants—without professional guidance.
2. Undergo appropriate testing
   Your clinician may order a repeat urinalysis, blood tests to assess clotting function and imaging if needed to rule out other causes.
3. Consider drug modification
   If a medication is confirmed as the likely trigger, your doctor may lower the dose, switch to a different class of drug or introduce protective measures (such as mesna with cyclophosphamide).
4. Follow up
   Persistent or recurrent haematuria warrants further urological assessment to ensure no other underlying pathology is at play.

By recognising the link between certain medications and urinary bleeding, you can work with your healthcare team to adjust treatment safely and maintain your overall well-being.

Taking Action When You Notice Blood in Your Urine

Seeing blood in your urine can be unsettling, but it’s important to remember that causes range from easily treated infections to more serious conditions that benefit from early detection. Whether the bleeding is visible or only detected on testing, you shouldn’t ignore it. Haematuria is a sign that something in your urinary system needs attention, and timely assessment can make all the difference to your outcome.

Any episode of visible haematuria—no matter how brief—warrants a prompt medical review. Jot down when you first noticed the change in colour, whether you experienced any pain or other symptoms at the same time, and if you’ve started any new medications or therapies lately. Even if the bleeding settles on its own, these details are invaluable for your clinician when piecing together the cause.

If you have heavy bleeding, severe pain, fever or difficulty passing urine, seek urgent care without delay. For less urgent cases—such as mild spotting or microscopic haematuria found on a routine test—arrange a consultation with a specialist urologist. They will guide you through the necessary investigations, from blood tests and imaging to endoscopic examination, ensuring that no stone is left unturned.

At Ashwin Sridhar Urology, we understand that privacy and discretion matter just as much as expertise. Whether you’re seeking a second opinion or require advanced diagnostics, our London-based practice offers confidential, patient-centred care. To discuss your symptoms and explore the next steps, book a private, discreet consultation today at https://www.ashwinsridharurology.com.