Blood in Urine (Hematuria): Causes, Symptoms, and Treatment

What is Blood in Urine?

Blood in urine, medically known as hematuria, occurs when red blood cells leak into the urinary tract. This can happen anywhere along the system, including the kidneys, ureters, bladder, or urethra. There are two types of hematuria:

• Gross hematuria: Visible blood that turns urine pink, red, or brown.
• Microscopic hematuria: Blood only visible under a microscope, often detected during routine tests.

While blood in urine can be alarming, it doesn’t always indicate a serious condition. However, it should never be ignored, as it can sometimes signal an underlying health issue requiring medical attention.

Source: Mayo Clinic

Common Causes

Blood in urine can stem from various conditions, ranging from mild to severe. Here are the most common causes:

• Urinary Tract Infections (UTIs): Bacteria entering the urethra can cause inflammation and bleeding, especially in the bladder (cystitis) or kidneys (pyelonephritis).
• Kidney Stones: Hard deposits of minerals in the kidneys or bladder can irritate the urinary tract, leading to bleeding.
• Enlarged Prostate: In men, an enlarged prostate (benign prostatic hyperplasia or BPH) can compress the urethra, causing urinary symptoms and blood in urine.
• Kidney Disease: Conditions like glomerulonephritis (inflammation of the kidney’s filtering system) can cause hematuria.
• Bladder or Kidney Cancer: Tumors in the urinary tract may bleed, especially in older adults or smokers.
• Exercise-Induced Hematuria: Strenuous exercise, like long-distance running, can cause temporary blood in urine due to bladder trauma or dehydration.
• Medications: Certain drugs, such as blood thinners (e.g., warfarin, aspirin), anti-cancer drugs (e.g., cyclophosphamide), or pain relievers (e.g., NSAIDs), can increase the risk of bleeding.
• Trauma: Injury to the kidneys, bladder, or urinary tract from accidents or medical procedures can cause bleeding.
• Inherited Disorders: Conditions like sickle cell anemia or Alport syndrome can affect kidney function and lead to hematuria.
• Sexually Transmitted Infections (STIs): Infections like chlamydia or gonorrhea can cause inflammation and bleeding in the urinary tract.

Sources: CDC, NIH

Associated Symptoms

Blood in urine may occur alone or with other symptoms, depending on the underlying cause. Common accompanying symptoms include:

• Pain or burning during urination (dysuria).
• Frequent or urgent need to urinate.
• Lower abdominal pain or pressure.
• Cloudy or foul-smelling urine.
• Back or side pain (flank pain), which may indicate kidney issues.
• Fever or chills, suggesting a possible infection.
• Nausea or vomiting, often linked to kidney stones or severe infections.
• Difficulty urinating or weak urine stream, common in prostate issues.

If blood in urine is accompanied by clots, severe pain, or inability to urinate, seek immediate medical attention.

Source: Cleveland Clinic

When to See a Doctor

You should consult a healthcare provider if you notice blood in your urine, even if it resolves on its own. However, certain signs warrant immediate medical evaluation:

• Visible blood in urine that persists or recurs.
• Blood clots in urine.
• Pain in the back, side, or abdomen.
• Difficulty urinating or inability to pass urine.
• Fever, nausea, or vomiting accompanying hematuria.
• Recent trauma to the abdomen or urinary tract.
• History of kidney disease, cancer, or recurrent UTIs.

Even if you don’t have other symptoms, microscopic hematuria detected in a urinalysis should be followed up with your doctor to rule out serious conditions.

Source: Urology Care Foundation

Diagnosis

To determine the cause of blood in urine, your doctor will perform a thorough evaluation, which may include:

Medical History and Physical Exam

Your doctor will ask about:

• Symptoms (e.g., pain, frequency, urgency).
• Medical history (e.g., UTIs, kidney stones, family history of kidney disease or cancer).
• Medications or supplements you’re taking.
• Recent injuries or procedures.

Diagnostic Tests

• Urinalysis: Checks for red blood cells, white blood cells (sign of infection), and other abnormalities.
• Urine Culture: Identifies bacteria or other organisms causing infection.
• Imaging Tests:
  • CT scan or MRI to visualize the kidneys, bladder, and ureters.
  • Ultrasound to check for stones, tumors, or blockages.
• Cystoscopy: A thin tube with a camera is inserted into the bladder to examine the urethra and bladder lining.
• Blood Tests: Evaluates kidney function (e.g., creatinine, BUN) or checks for signs of infection or anemia.
• Kidney Biopsy: Rarely needed, but may be performed if kidney disease is suspected.

Source: NIH - StatPearls

Treatment Options

Treatment depends on the underlying cause of hematuria. Here are common approaches:

Medical Treatments

• Antibiotics: Prescribed for UTIs or bacterial infections (e.g., nitrofurantoin, ciprofloxacin).
• Pain Relief: NSAIDs (e.g., ibuprofen) or prescription medications for kidney stones or severe pain.
• Alpha-Blockers: Used to relax the prostate and improve urine flow in men with BPH (e.g., tamsulosin).
• Lithotripsy or Surgery: For large kidney stones or tumors blocking the urinary tract.
• Immunosuppressants: For kidney diseases like glomerulonephritis (e.g., corticosteroids).
• Chemotherapy or Radiation: If cancer is diagnosed.

Home and Lifestyle Remedies

• Hydration: Drink plenty of water (8–10 glasses daily) to flush out bacteria or small kidney stones.
• Dietary Changes:
  • Reduce salt and protein intake if kidney disease is present.
  • Avoid foods high in oxalates (e.g., spinach, nuts) if prone to kidney stones.
• Cranberry Juice: May help prevent UTIs (though not a treatment for active infections).
• Heat Therapy: A heating pad can ease discomfort from kidney stones or UTIs.

Always consult your doctor before trying home remedies, especially if you have a known medical condition.

Source: Mayo Clinic - UTI Treatment

Prevention Tips

While not all causes of hematuria are preventable, you can reduce your risk with these strategies:

• Stay Hydrated: Drink enough water to keep urine pale yellow. Aim for at least 2 liters daily.
• Practice Good Hygiene:
  • Wipe front to back after using the toilet to prevent bacterial spread.
  • Urinate after sexual intercourse to flush out bacteria.
• Avoid Irritants:
  • Limit caffeine, alcohol, and spicy foods, which can irritate the bladder.
  • Quit smoking to reduce bladder and kidney cancer risk.
• Exercise Safely:
  • Stay hydrated during intense workouts.
  • Avoid holding urine for long periods, especially during exercise.
• Manage Chronic Conditions:
  • Control blood pressure and diabetes to protect kidney health.
  • Follow up regularly if you have a history of kidney stones or UTIs.
• Regular Check-Ups: Routine urinalysis can detect microscopic hematuria early.

Source: CDC - Kidney Disease Prevention

Emergency Warning Signs

Seek immediate medical attention if you experience any of the following alongside blood in urine:

• Severe pain in the back, side, or abdomen that doesn’t improve.
• Inability to urinate or passing only small amounts despite urgency.
• Large blood clots in urine or continuous bleeding.
• Signs of shock, such as dizziness, rapid heartbeat, or fainting.
• High fever (over 101°F or 38.3°C) with chills, indicating a possible kidney infection.
• Trauma to the abdomen, back, or pelvis (e.g., from a fall or accident).

These symptoms may indicate a life-threatening condition, such as a kidney infection (pyelonephritis), obstructed urinary tract, or internal bleeding. Call 911 or go to the nearest emergency room.

Source: WHO - Hematuria Guidelines