menstrual blood for blood originating in the urine; men may confuse blood in the urine with blood in an ejaculation (which usually suggests a prostate problem).
What causes it?
Blood in the urine can have a variety of causes. As a rule, blood visible to the eye is caused by a problem in the lower urinary tract (ureter, bladder, or urethra), and microscopic blood in the urine usually originates in the upper tract (kidneys).
Here’s a list of possible causes:
Kidney and urinary tract problems
-Kidney stones
-Urinary tract infection (cystitis) (Along with kidney stones, UTIs are the most common cause of blood in the urine of people under 40)
-Inflammation of the bladder, urethra, or kidney (called glomerulonephritis)
–Cancer of the bladder, kidney, or prostate
-Injury to the upper or lower urinary tract
-Recent urinary tract procedure, such as catheterization, circumcision, surgery, or kidney biopsy
-Polycystic kidney disease
-Kidney failure (acute or chronic)
–Kidney disease following strep throat (post-streptococcal glomerulonephritis) a common