The patient did not think he had a diabetic foot, because he did not have a foot wound ulcer like other patients, but only pain and burning. Our diabetic foot department reminds us that this is also a diabetic foot, and the consequences are equally serious if not treated in time. Since there are many such patients, it is necessary to remind you here that not all diabetic foot patients have wound infection and ulceration. The progression from mild to severe generally goes through the following periods and is divided into several grades: Grade 0 – a foot with high risk factors for ulceration but without any wound. Grade 1 – a foot with a superficial skin ulcer, clinically free of infection, highlighted by a neurological ulcer, clinically free of infection. Grade 2 – deeper, penetrating ulcers, often combined with soft tissue infection but without osteomyelitis or deep abscesses, and some specific bacteria such as anaerobic and gas-producing bacteria may be present at the ulcer site. It is a deeper ulcer, often combined with soft tissue infection, without abscess or infection of the bone. Grade 3 – often accompanied by deep tissue ulcers, often affecting bone tissue, with deep abscesses or osteomyelitis. Grade 4 – mainly ischemic ulcers, localized or gangrene in specific areas of the foot. Gangrene without severe pain is suggestive of neuropathy, and the surface of the necrotic tissue may be infected. Grade 5 – gangrene affecting the entire foot, with aortic obstruction playing a major etiologic role and neuropathy and infection also being influential factors. From this we can see that for early stage patients, there is no rotting of the foot. But this does not mean that treatment is not needed. If it is allowed to progress, the wound may deteriorate more rapidly once it appears. Therefore, we must detect foot abnormalities in a timely manner, and once detected, we must promptly refer to a department specializing in the treatment of diabetic foot to receive treatment to avoid the development of a serious diabetic foot.