Blood in Your Urine? Here Is Why You Should Never Ignore It

Published: May 2026 • Written by David Robbins, MD, Board-Certified Urologist, North Miami, FL

Seeing blood in your urine can be alarming. For many patients, it happens once and then seems to resolve on its own—so they assume it was nothing and move on. This is one of the most dangerous assumptions in urology.

Any episode of blood in the urine—even a single occurrence—requires evaluation by a urologist. While the cause is often benign, hematuria can also be the first and only sign of bladder cancer, kidney cancer, or other serious conditions. The evaluation is straightforward, and catching a problem early can be life-saving.

What Is Hematuria?

Hematuria is the medical term for blood in the urine. It can be:

• Gross hematuria — blood that is visible to the naked eye. The urine may appear pink, red, or cola-colored.
• Microscopic hematuria — blood that is only detected on a laboratory urinalysis. You will not see it, but it is there.

Both types require the same workup. The fact that you cannot see it does not mean it is less significant.

What Causes Blood in the Urine?

Hematuria can originate anywhere along the urinary tract—from the kidneys to the ureters to the bladder to the urethra. Common causes include:

• Urinary tract infection (UTI)
• Kidney stones
• Benign prostatic hyperplasia (BPH) — enlarged prostate
• Vigorous exercise — sometimes called "runner's hematuria"
• Medications — blood thinners like warfarin or aspirin can contribute
• Bladder cancer
• Kidney cancer
• Urothelial carcinoma of the ureter or renal pelvis

In many cases, the cause turns out to be benign. But that can only be determined after a proper evaluation. The problem is not the blood itself—it is what you might miss if you do not look.

The Hematuria Workup: What to Expect

The AUA recommends a standard hematuria evaluation that typically includes:

1. Urinalysis with microscopy — to confirm the presence of blood and evaluate for infection
2. Urine cytology — examining urine cells under a microscope for signs of malignancy
3. CT urogram or renal ultrasound — imaging of the kidneys, ureters, and bladder to identify stones, tumors, or structural abnormalities
4. Cystoscopy — a brief office procedure in which a small camera is inserted through the urethra to visually inspect the bladder lining. This is the gold standard for detecting bladder cancer.

The entire workup can typically be completed in one or two office visits. It is not painful, it is not complicated, and it provides the information needed to either identify a serious problem or give you peace of mind.

Why Delay Is Dangerous

Bladder cancer is the fourth most common cancer in American men. Its most common presenting symptom is painless gross hematuria—blood in the urine with no other symptoms. When caught early, bladder cancer is highly treatable. When caught late, treatment becomes far more complex and outcomes significantly worse.

The message is clear: do not dismiss blood in your urine as "probably nothing." Let a urologist determine that.

Schedule Your Evaluation

If you have noticed blood in your urine, or if a blood test or routine urinalysis has detected microscopic hematuria, contact a urologist for evaluation. At Urological Consultants of Florida, Dr. Robbins provides complete kidney and urinary health services including in-office cystoscopy, advanced imaging, and comprehensive cancer screening.

Call (305) 575-2771 to schedule your appointment at our North Miami office.