gangrene

Overview
Gangrene is a serious and potentially life-threatening condition where body tissue dies due to a lack of blood supply, severe infection, or trauma. It most commonly affects the extremities like toes, fingers, feet, or hands, but it can also develop internally. The condition can be dry (from reduced circulation), wet (from infection), or gas gangrene (a rapidly spreading infection caused by specific bacteria).

Why It’s Important
Gangrene requires urgent medical attention. If not treated quickly, it can lead to amputation, sepsis, or death. The condition can progress rapidly, especially in people with diabetes, peripheral artery disease, or weakened immune systems. Recognizing early signs can mean the difference between recovery and life-altering outcomes.

Quick Facts

  • Affects people with poor circulation, chronic illnesses, or severe injuries

  • Can occur in both external limbs and internal organs

  • Types: Dry, Wet, and Gas gangrene

  • Requires emergency treatment, often surgical

  • Often seen in people with diabetes, frostbite, or after trauma

What Happens in the Body
Gangrene occurs when tissue is deprived of oxygen-rich blood, causing it to die. In dry gangrene, the area becomes shriveled and black due to lack of circulation. In wet or gas gangrene, bacterial infections invade the tissue, producing toxins and gas, causing rapid tissue breakdown, swelling, and systemic toxicity.

Common Signs and Symptoms

  • Skin discoloration (blue, purple, black, or green)

  • Foul-smelling discharge or pus

  • Sudden pain, followed by numbness

  • Swelling or blisters on the skin

  • Crackling sensation under the skin (gas gangrene)

  • Fever, low blood pressure, confusion if infection spreads

Diagnosis

  • Physical exam and review of medical history

  • Imaging (X-ray, MRI, or CT) to assess gas or tissue damage

  • Tissue or fluid cultures to identify bacterial infection

  • Blood tests for signs of infection or sepsis
    See a doctor immediately if:

  • You notice sudden skin discoloration, numbness, or severe pain

  • You have an open wound that becomes foul-smelling or discolored

  • You have diabetes or vascular disease and develop a skin ulcer or sore

Treatment and Management

  • Emergency surgery to remove dead tissue (debridement or amputation)

  • Antibiotics, especially IV, for infections

  • Hyperbaric oxygen therapy to enhance tissue oxygenation in some cases

  • Vascular surgery to restore blood flow if appropriate

  • Wound care, supportive care, and treatment of underlying conditions

Risks and Complications

  • Amputation of affected limbs

  • Sepsis (widespread infection)

  • Organ failure

  • Permanent disability

  • Death, especially if untreated or if infection spreads quickly

Who Is at Risk

  • People with diabetes or peripheral artery disease

  • Individuals with weakened immune systems

  • People with severe injuries, burns, or frostbite

  • Patients recovering from surgery or with infected wounds

  • Individuals with chronic smoking history or clotting disorders

Related Conditions

  • Diabetic foot ulcers

  • Peripheral artery disease (PAD)

  • Sepsis

  • Clostridial myonecrosis (gas gangrene)

  • Chronic wounds or pressure sores

When to See a Doctor

  • Immediately, if you have blackened skin, a rapidly worsening wound, or signs of infection

  • If you have diabetes or circulation problems and notice unusual skin changes or ulcers

  • If you experience unexplained fever, confusion, or weakness after a wound or trauma

Last Updated: June 28, 2025