Diabetic Foot Complications

Overview

Diabetic foot complications arise from peripheral neuropathy, peripheral arterial disease, and impaired immune function in people with diabetes. Loss of protective sensation means injuries may go unnoticed, and poor circulation impairs healing. Foot ulcers are the most common serious complication and a leading cause of lower limb amputation in diabetes.

Symptoms

• Numbness or loss of sensation in the feet
• Foot ulcers or open wounds that do not heal
• Burning or tingling pain in the feet, especially at night
• Skin changes including dryness, cracking, or discoloration
• Ingrown or fungal toenails
• Foot swelling or deformity in advanced cases
• Foul odor or discharge from wounds

Causes

• Peripheral neuropathy leading to loss of protective sensation
• Peripheral arterial disease reducing blood flow to the feet
• Impaired immune function and delayed wound healing from hyperglycemia

Risk factors

• Poor glycemic control or long-standing diabetes
• History of previous foot ulcer or amputation
• Peripheral neuropathy or peripheral arterial disease
• Foot deformities such as Charcot foot or bunions
• Smoking, which worsens peripheral circulation

Diagnosis

Clinical examination includes monofilament testing for neuropathy, ankle-brachial index for vascular assessment, wound culture if infection is suspected, and imaging for osteomyelitis. A comprehensive foot examination should be performed at least annually in all people with diabetes.

Treatment & management

Management depends on severity and may include offloading the affected area, wound care and debridement, infection treatment with appropriate antibiotics, vascular assessment and revascularization if indicated, glycemic optimization, and in severe cases surgical intervention. Multidisciplinary care improves outcomes.

Management is individualized and discussed with benefits, limitations, and follow-up.

Prevention & self-care

Daily foot inspection, proper footwear and shoe fitting, regular podiatric care, glycemic control, avoiding walking barefoot, prompt treatment of minor wounds, smoking cessation, and annual comprehensive foot examinations.

When to seek medical attention

• Any new foot wound, ulcer, or blister that does not heal within a few days
• Signs of infection such as redness, swelling, warmth, pus, or fever
• New or worsening numbness, burning, or tingling in the feet
• Color changes in the feet such as pale, blue, or dark discoloration
• Pain in the legs when walking that resolves with rest

Frequently asked questions