The main causes of diabetic foot are as follows: The first one is poor blood sugar control in patients. Some patients have long neglected their blood sugar levels, leading to consistently high levels. The second cause is vascular disease in the lower limbs of the patient, including arteriosclerosis, with severe cases leading to occlusion and subsequent ulceration of the feet. The third reason is the presence of diabetic peripheral neuropathy in patients, which results in abnormal sensations or numbness in the feet. Many patients wearing new shoes or stepping on sharp objects inadvertently can lead to diabetic foot. The fourth cause is infection induced by patients who initially neglect minor foot injuries, or who improperly manage such injuries at home, leading to the development of diabetic foot. Therefore, we advise diabetics to maintain good control of their blood sugar and take timely measures to prevent diabetic foot.