Yeah, my mom and I both, but ours is usually detected in tests, not seen, which seems to be the case with him.
I guess if you've already seen a doctor and it's gone away then there isn't much to be worried about. It was probably just something minor that happens once in a while.
I got this from emedicinehealth.com:
"
Causes of Blood in Urine
Hematuria has many different causes.
- Blood in the urine can come from any condition that results in infection, inflammation, or injury to the urinary system.
- Typically, microscopic hematuria indicates damage to the upper urinary tract (kidneys), while visible blood indicates damage to the lower tract (ureters, bladder, or urethra). But this is not always the case.
- The most common causes in people younger than 40 years are "stones" in the kidneys or ureters and urinary tract infections.
- These may cause hematuria in older people, but cancers of the kidney, bladder, and prostate become a more common concern with people older than 40 years.
- Several conditions causing hematuria may exist at the same time.
- Some causes of hematuria are serious, others are not. Your health care provider will do tests to help tell the difference.
The well-known causes of blood in the urine include the following:
- Kidney stones
- Infections - Of the urinary tract or genitals, especially in women
- Blockage of the urinary tract, usually the urethra - By a stone, a tumor, a narrowing of the opening (stricture), or a compression from surrounding structures
- Cancer of the kidney, bladder, or prostate
- Kidney disease
- Blood clotting disorders
- Injury to the upper or lower urinary tract, as in a car wreck or a bad fall
- Medications - Antibiotics (for example, rifampin), analgesics such as aspirin, anticoagulants (blood thinners such as warfarin), phenytoin, quinine
- Benign (noncancerous) enlargement of the prostate - Known as benign prostatic hypertrophy (BPH), a common condition in older men
- Chronic diseases such as diabetes, hypertension, and sickle cell anemia
- Viral infections
- Inflammation of the kidney - Usually of unknown cause
- Strenuous exercise, especially running - Results from repeated jarring of the bladder
Sometimes no cause is found for blood in the urine.
- If serious conditions such as cancer, kidney disease, and other chronic diseases that cause kidney damage or bleeding are ruled out, the cause is almost certainly not serious.
- The hematuria will probably go away by itself or continue as a chronic condition without doing harm.
Urine can be colored pink, red, or brown for reasons that have nothing to do with bleeding in the urinary tract.
- Foods - Beets, berries, rhubarb in large amounts
- Food coloring
- Medications - Certain laxatives and pain medications
- Menstrual blood
- Liver diseases - Also can be very serious"
I doubt you have to worry about any of the 'serious' issues. But I just posted this so you could see what different normal reasons there are.