There are many reasons that you might have blood in your urine. Having blood in your urine does not necessarily mean you have kidney disease. Some common causes are:

  • Menstruation
  • Strenuous (difficult) exercise
  • Sexual activity
  • Having a virus
  • Injury
  • Having an infection, such as a urinary tract infection (UTI)

Other more serious problems can also cause you to have blood in your urine. Some of these problems include:

  • Kidney or bladder cancer
  • Irritation or swelling in your kidneys, prostate (in men) or another part of your urinary tract
  • Polycystic kidney disease
  • Blood clots or diseases that cause problems with blood clotting
  • Sickle cell disease