what causes gangrene
Gangrene happens when body tissue dies , usually because it either loses its blood supply or becomes severely infected—or both.
Main causes of gangrene
- Poor blood flow (ischemia)
When arteries narrow or block (from atherosclerosis, peripheral artery disease, or blood clots), tissues don’t get enough oxygen and nutrients and slowly die. This often leads to dry gangrene , especially in toes, fingers, or limbs.
- Bacterial infection
Untreated or deep infections can destroy tissue and cut off local blood flow, causing wet gangrene or gas gangrene (often from Clostridium and other bacteria).
- Trauma or injury
Severe wounds, crush injuries, burns, frostbite, or surgery can damage blood vessels and open the door for bacteria, raising the risk of infection‑driven gangrene.
Common risk conditions
Several underlying problems make gangrene more likely:
- Diabetes – damages nerves and blood vessels, especially in feet, so injuries may go unnoticed and heal poorly.
- Atherosclerosis / peripheral artery disease – narrowed or blocked arteries reduce blood flow to limbs.
- Weakened immune system – from HIV, chemotherapy, long‑term steroid use, malnutrition, or older age, which lets infections spread more easily.
- Smoking and obesity – both worsen circulation and slow wound healing.
Types linked to different causes
Type of gangrene| Typical cause(s)
---|---
Dry gangrene| Slow loss of blood flow (e.g., advanced peripheral artery
disease, diabetes). 37
Wet gangrene| Infection on top of poor blood flow (often after injury or
surgery). 357
Gas gangrene| Deep‑tissue infection with gas‑forming bacteria (often
Clostridium after trauma or surgery). 379
Internal gangrene| Blocked blood flow to an organ (e.g., intestine,
appendix, gallbladder). 37
Necrotizing fasciitis| Rapid‑spreading bacterial infection of deep skin
and muscle layers. 37
If you notice skin that turns black, blue, or very pale, feels cold, or has a foul‑smelling discharge—especially with severe pain or fever—this can be a medical emergency and needs urgent care.
Information gathered from public forums or data available on the internet and portrayed here.