What causes blood in the urine?
Seeing red, pink, or cola-colored urine in the toilet bowl can cause your heart to stop. It is an alarming sight that triggers instant anxiety.
The medical term for blood in the urine is hematuria. While noticing it means you should contact your doctor, take a deep breath: many common causes are temporary, treatable, and not life-threatening.
Here is a patient-focused breakdown of why this happens, what it could mean, and how doctors sort through the possibilities.
Visible vs. Invisible Blood: The Two Types
Doctors divide blood in the urine into two distinct categories based on how it is discovered:
- Gross Hematuria (Visible): This is when you can see the blood with your own eyes. It does not take much blood to change the color of your urine—just a small amount can turn urine pink, red, or brownish.
- Microscopic Hematuria (Invisible): Your urine looks completely normal to the naked eye, but a doctor finds hidden red blood cells under a microscope during a routine wellness check or after a urine dipstick test.
Common Causes of Blood in the Urine
When the urinary system gets irritated, inflamed, or injured, red blood cells can leak into your urine. Here are some of the most frequent culprits:
Urinary Tract Infections (UTIs)
Urinary Tract Infection is one common cause, especially for women. When bacteria enter the bladder, they can cause inflammation and raw, irritated tissue that may bleed slightly.
Kidney or Bladder Stones
Mineral crystals can clump together inside your kidneys or bladder to form hard stones. If these stones move or scrape against the delicate lining of your urinary tract, they can cause friction and bleeding—much like a scratch on your skin.
An Enlarged Prostate (For Men)
The prostate gland sits right beneath the bladder and surrounds the urethra. As men age, the prostate often enlarges. An enlarged prostate can press against the urinary tube and may cause small surface blood vessels to bleed.
Intense or Strenuous Exercise
Known colloquially as "marathon runner's hematuria," strenuous or high-impact exercise can occasionally cause visible blood in the urine. It may happen due to minor trauma to the bladder wall during intense movement, dehydration, or other exercise-related strain. If blood in the urine persists, recurs, or is not clearly linked to exercise, it should be checked.
Certain Medications
Some drugs can make bleeding more noticeable or contribute to blood in the urine. Blood thinners, anticoagulants, and antiplatelet medicines, such as aspirin, warfarin, or newer anticoagulants, can make bleeding easier. Some medicines, including certain cancer drugs, can irritate the urinary tract or bladder lining. Medication-related blood in the urine should still be discussed with a doctor because medicine may reveal bleeding from another cause rather than being the only explanation.
Painful vs. Painless Blood: Why the Difference Matters
When you tell a doctor there is blood in your urine, one of the very first things they will ask is: "Did it hurt?" Pain can point toward common causes such as infection or stones, but painless blood in the urine is especially important because it may occur without any other warning sign.
| If the Blood Is... | Common Symptoms Include... | What It Usually Points To... |
|---|---|---|
| Painful | Burning when you pee, pelvic pain, sharp side or back pain, or a constant urgency to run to the bathroom. | A urinary tract infection (UTI), kidney stone, bladder stone, or another inflammatory cause. |
| Painless | Seeing red or pink urine with no pain, burning, or discomfort. | Requires a closer look to rule out bladder, kidney, prostate, medication-related, or rarely, tumor-related causes. |
The Golden Rule of Hematuria: Painless blood in the urine should never be ignored. While it can still be something simple, painless bleeding is a classic warning sign that a doctor needs to investigate to rule out more serious urinary tract problems.
What to Do Next
First, consider what you ate recently. Harmless foods like beets, blackberries, or rhubarb, as well as certain food dyes, can temporarily tint your urine a deep pink or red. If you ate a large plate of beets yesterday, the color may clear within a day or two.
However, if it is not clearly food-related, you should contact your healthcare provider. Investigating the cause is usually straightforward. Your doctor will likely start with a simple urine test to check for infection, blood cells, or other abnormalities. Depending on what they find, they may order routine blood tests, imaging such as an ultrasound or CT scan, or refer you to a urologist for further assessment, which may include cystoscopy in selected cases.
Disclaimer: This educational content does not constitute medical advice; always consult a qualified physician or urologist for any personal health concerns or diagnostic decisions.
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