(HealthDay News) -- Gangrene occurs when a portion of bodily tissue dies due to lack of blood supply to the area.

The U.S. National Library of Medicine says these factors increase a person's risk of developing gangrene:

  • Suffering a serious injury.
  • Having a disease of the blood vessels, such as hardening of the arteries.
  • Being diabetic.
  • Having a compromised immune system (ie., from HIV or chemotherapy).
  • Having surgery.