Causes of Hematuria in Males: What Every Man Should Know

Blood in urine can originate from any structure in the male urinary tract, including the kidneys, ureters, bladder, prostate, or urethra, and the cause determines whether it resolves on its own or requires urgent intervention. Hematuria presents in two forms: gross hematuria, visible to the naked eye, and microscopic hematuria, identified when laboratory testing reveals more than three red blood cells per high-power field.

The colour can range from light pink to dark brown, depending on the amount of blood and how long it has been in the urinary tract. Certain foods, medications, and intense exercise can temporarily alter urine colour without actual bleeding, making proper testing necessary for accurate diagnosis.

Urinary Tract Infections

Bacterial infections in the urinary tract cause inflammation of the bladder lining or urethra, leading to blood in urine. Men with UTIs typically experience burning during urination, increased urinary frequency, and urgency alongside hematuria. The infection irritates and damages the delicate mucosal tissue, causing small amounts of bleeding.

UTI risk increases with age, particularly in men with enlarged prostates or those using catheters. Incomplete bladder emptying creates an environment where bacteria multiply. Diagnosis involves urine culture to identify the specific bacteria, guiding appropriate antibiotic selection.

Did You Know? The male urethra measures approximately 20 centimetres, compared to 4 centimetres in females. This anatomical difference explains why UTIs occur less frequently in men but often indicate underlying urinary tract abnormalities when they do occur.

Benign Prostatic Hyperplasia

Prostate enlargement is common in ageing men, with the gland growing from its normal walnut size to considerably larger dimensions. As the prostate expands, increased vascularity develops within the tissue. These blood vessels can rupture spontaneously or during straining, causing blood to appear in urine.

Men with BPH often notice a weak urinary stream, hesitancy, starting urination, dribbling after voiding, and nocturia before hematuria develops. The enlarged prostate compresses the urethra, creating turbulent urine flow that can damage fragile blood vessels. Digital rectal examination and PSA testing help evaluate prostate size and exclude malignancy.
Medications that shrink the prostate or relax bladder neck muscles often reduce BPH-related bleeding. For persistent cases, minimally invasive procedures can remove excess prostate tissue while preserving urinary function.

Kidney and Bladder Stones

Mineral deposits form within the urinary system when urine becomes supersaturated with calcium, oxalate, uric acid, or other substances. These stones range from sand-grain size to several centimetres in diameter. As stones move through the urinary tract, their rough surfaces scrape against tissue, causing bleeding and intense pain.

Kidney stones typically produce severe flank pain radiating to the groin, accompanied by nausea and restlessness. Bladder stones may cause intermittent pain in the lower abdomen, particularly during urination. Stone analysis after passage or removal identifies the composition, guiding dietary modifications to prevent recurrence.

Adequate hydration remains the primary prevention strategy, with daily fluid intake sufficient to produce clear or light yellow urine. Dietary modifications depend on stone type, as calcium oxalate stones require different restrictions than uric acid stones.

Prostate and Bladder Cancer

Malignancies within the urinary tract frequently present with painless hematuria as an early symptom. Bladder cancer develops most commonly in the bladder lining, with tumours creating fragile blood vessels that bleed intermittently. Prostate cancer can invade the urethra or bladder neck, causing blood to appear in urine or semen.

Important Note Painless hematuria in men over 40, particularly those with a smoking history, warrants thorough evaluation to exclude urinary tract malignancy.

Risk factors for bladder cancer include tobacco use, occupational chemical exposure (dyes, rubber, and leather industries), and chronic bladder inflammation. Prostate cancer risk increases with age and family history. Cystoscopy allows direct visualisation of the bladder interior, while prostate biopsy confirms suspected prostate malignancy.

Kidney Disease and Glomerulonephritis

The kidney’s filtering units, called glomeruli, can become inflamed due to immune disorders, infections, or inherited conditions. Damaged glomeruli allow red blood cells to leak into urine, often accompanied by protein. This microscopic hematuria may persist without obvious symptoms until kidney function deteriorates.

IgA nephropathy, a common form of glomerulonephritis, often presents with visible hematuria during respiratory infections. Post-streptococcal glomerulonephritis can develop weeks after throat or skin infections. Blood tests measuring kidney function and urine protein levels help assess severity, while a kidney biopsy provides a definitive diagnosis.
Men with glomerulonephritis require monitoring of blood pressure and kidney function, as some forms progress to chronic kidney disease. Treatment targets the underlying cause and may include immunosuppressive medications for autoimmune conditions.

Trauma and Physical Injury

Direct trauma to the kidneys, bladder, or external genitalia causes hematuria through tissue damage and blood vessel rupture. Contact sports, motor vehicle accidents, and falls can injure urinary structures. The kidneys, despite protection from the ribcage and back muscles, remain vulnerable to blunt force impact.

Straddle injuries affecting the perineum can damage the urethra, causing blood at the urethral opening rather than in voided urine. Pelvic fractures frequently involve bladder or urethral injury, requiring imaging to assess the extent before catheterisation.
Intense exercise, particularly long-distance running, can produce temporary hematuria through repetitive bladder trauma or breakdown of red blood cells in foot capillaries. This exercise-induced hematuria typically resolves within 48 hours of rest.

Medications and Medical Procedures

Blood-thinning medications, including warfarin, aspirin, and direct oral anticoagulants, increase bleeding tendency throughout the body, including the urinary tract. These medications don’t cause hematuria directly but unmask underlying conditions or amplify minor bleeding that would otherwise go unnoticed.

Recent urological procedures, including cystoscopy, prostate biopsy, kidney biopsy, or catheterisation, commonly cause temporary hematuria. Post-procedure bleeding typically appears bright red initially, fading to pink before clearing. Urologists provide specific guidance on expected duration and warning signs requiring immediate attention.

Quick Tip Keep a record of all medications, including over-the-counter drugs and supplements, to share with your urologist. Certain herbal supplements affect bleeding risk and may contribute to hematuria.

Clinical Evaluation and Diagnostic Workup

Clinical evaluation of hematuria follows a systematic approach to identify the bleeding source. The patient’s age, symptom pattern, and medical history guide initial testing. Younger men with painful hematuria and urinary symptoms often have infectious causes, while painless hematuria in older men requires thorough evaluation for malignancy.
Imaging studies, such as CT urography or ultrasound, visualise the kidneys and upper urinary tract for stones, masses, or structural abnormalities. Cystoscopy provides direct bladder inspection, identifying tumours, stones, or inflammatory changes invisible on imaging. Urine cytology examines cells shed into urine for malignant characteristics.

Steps for Managing Hematuria Symptoms

Document your symptoms accurately by noting urine colour at different times, whether blood appears at the start, throughout, or end of urination, and any associated pain or other symptoms. Photograph the unusual urine colour for your medical appointment.

Maintain adequate hydration to dilute urine and reduce irritation to the urinary tract. Clear or pale yellow urine indicates sufficient fluid intake. Avoid excessive caffeine and alcohol, which can irritate the bladder lining.

Review your medications and supplements with attention to blood thinners, aspirin, and any recent medication changes. Do not stop prescribed anticoagulants without medical guidance, as this creates other health risks.

Track dietary intake around hematuria episodes, noting consumption of beetroot, berries, rhubarb, or food colourants that can alter urine colour without actual bleeding.

Prepare comprehensive information for your medical appointment, including symptom timeline, medical history, family history of kidney disease or cancer, and occupational exposures.

When to Seek Professional Help

• Visible blood in urine lasting more than 24 hours
• Blood clots in urine, causing difficulty urinating
• Hematuria accompanied by fever, chills, or flank pain
• Unexplained weight loss alongside urinary symptoms
• Persistent microscopic hematuria found on repeat testing
• Any hematuria in men over 40, particularly with a smoking history
• Hematuria following trauma to the back, abdomen, or pelvis
• Urinary retention or inability to pass urine

Commonly Asked Questions

Can dehydration cause blood in urine?

Severe dehydration concentrates urine and can irritate the bladder lining, potentially causing microscopic bleeding. More commonly, dehydration promotes kidney stone formation, which then causes hematuria through tissue abrasion. Concentrated urine also appears darker, sometimes mistaken for blood.

Does hematuria always indicate serious disease?

Many hematuria cases result from benign, treatable conditions like infections, small kidney stones, or medication effects. However, since hematuria can also signal malignancy or progressive kidney disease, proper evaluation is necessary regardless of other symptoms or lack thereof.

How long should I wait before seeing a doctor about blood in my urine?

Any episode of visible hematuria warrants medical evaluation, ideally within a few days. Microscopic hematuria found incidentally should prompt follow-up testing. Hematuria with pain, fever, or difficulty urinating requires same-day assessment.

Can sexual activity cause hematuria in men?

Vigorous sexual activity can occasionally cause temporary hematuria or blood in semen through minor trauma to the prostate or urethra. This typically resolves within a day or two. Persistent bleeding after sexual activity requires evaluation for underlying conditions.

Will hematuria resolve on its own?

Some causes, like minor infections, small passing stones, or exercise-induced bleeding, resolve spontaneously or with minimal treatment. Other causes require specific intervention. Since patients cannot distinguish benign from serious causes based on symptoms alone, medical evaluation determines appropriate management.

Next Steps

Any episode of visible hematuria requires medical evaluation, as symptoms alone cannot distinguish benign causes, such as infection or small stones, from malignancy or progressive kidney disease. Painless hematuria in men over 40, or hematuria accompanied by fever, flank pain, or blood clots, warrants same-day or urgent assessment. Documenting urine colour, symptom timing, and current medications before your appointment supports a more efficient diagnostic workup.

If you are experiencing visible blood in urine, painless hematuria, a weak urinary stream, or urinary frequency, consulting an accredited urologist can provide a comprehensive evaluation and help clarify the appropriate diagnostic and treatment options available.