Diabetes mellitus is a group of metabolic diseases characterized by high blood glucose. Diabetic patients with long duration and poor glycemic control often have a variety of acute and chronic complications or concomitant conditions. Foot problems are one of their common chronic complications and are often a factor in a patient’s hospitalization, making them a major threat to diabetics. However, why are diabetic patients prone to foot problems? Causes of diabetic foot 1. Peripheral nerve and peripheral vascular lesions: When the lesion invades the sensory nerve, it will cause the patient to gradually lose the sensation of temperature, pain and vibration. Lack of pain warning makes the patient’s feet easy to be injured, for example, shoes do not fit, blisters are easy to occur, there is a foreign body in the shoe, the patient often does not notice the injury; invasion of motor nerve will cause small muscle atrophy, foot deformation, easy to make the force parts of the injury; 2, lower limb vascular occlusion: diabetic patients due to the long-term impact of high blood sugar, lower limb vascular sclerosis, blood vessel wall thickening, elasticity decreased, easy to form thrombosis The lower extremity vascular occlusion and nerve damage at the branch end can cause lower extremity lesions. The “foot” is the farthest from the heart, the occlusion phenomenon is the most serious, thus leading to edema, blackening, decay, necrosis, the formation of gangrene. 3, diabetic patients with low skin resistance, very vulnerable to external factors, resulting in damage and infection.