You have haematuria if you have red blood cells in your urine. It may be unimportant; but it can be fatal. Hematuria can be microscopic(blood cells seen only through microscope) or macroscopic(blood visible to naked eye).

Attribution: Avallain

See also:

• Cause of hematuria
• When to seek medical help
• Diagnosis of hematuria
• Causes of urine color change
• Causes of blood in urine