Risk factorsBy Mayo Clinic staff
Almost anyone — including children and teens — can have red blood cells in the urine. Factors that make this more likely include:
- Age. Many men older than 50 have occasional hematuria due to an enlarged prostate gland.
- Your sex. More than half of all women will have a urinary tract infection at least once in their lives, possibly with some urinary bleeding. Younger men are more likely to have kidney stones or Alport syndrome, a form of hereditary nephritis that can cause blood in the urine.
- A recent infection. Kidney inflammation after a viral or bacterial infection (post-infectious glomerulonephritis) is one of the leading causes of visible urinary blood in children.
- Family history. You may be more prone to urinary bleeding if you have a family history of kidney disease or kidney stones.
- Certain medications. Aspirin, nonsteroidal anti-inflammatory pain relievers, and antibiotics such as penicillin are known to increase the risk of urinary bleeding.
- Strenuous exercise. Long-distance runners are especially prone to exercise-induced urinary bleeding. In fact, the condition is sometimes called jogger's hematuria. But anyone who works out strenuously can develop symptoms.
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- Urinary tract infections: What you need to know. National Kidney & Urologic Diseases Information Clearinghouse. http://kidney.niddk.nih.gov/KUDiseases/pubs/uti_ES/index.aspx. Accessed Aug. 2, 2011.
- Hematuria (blood in the urine). National Kidney & Urologic Diseases Information Clearinghouse. http://kidney.niddk.nih.gov/KUDiseases/pubs/hematuria/. Accessed Aug. 2, 2011.