Hematuria

Hematuria is the presence of blood in the urine. It may have a benign cause, but in some cases can be caused by an illness that could cause death.      

Causes
Problems with the urogenital system (bladder, urinary tract, urethra), kidneys
Renal cell carcinoma
Urinary tract infections
Cystitis
Bladder cancer
Pyelonephritis
Prostate cancer
other prostate problems (enlarged prostate)
Urethritis
Wilms tumor
Kidney stones
Glomerulonephritis
Possibly, allergies

 When it might be something else
False alarms can be raised when people have red urine caused by certain medications or eating certain foods. Usually, drugs which cause red or bloody urine should come with warnings either that it will happen or to see a doctor if it does. 

Bloody urine (pee) can happen for women on their periods.

It might be something else if:
food (like beetroot) is turning the urine red or pink
medicine or drugs may be turning the urine red or brown
bleeding is coming from the rectum (bum) instead
the woman is on her period

Self diagnosing
It is not recommended to self diagnose hematuria.

References

Category:Medical signs
Category:Urinary problems