Pressure ulcers, also known as bedsores, are divided into four main stages, and their prevention relies mainly on avoiding prolonged pressure and maintaining local cleanliness. 1. Pressure sores are caused by prolonged pressure on local tissues, resulting in tissue ulceration and necrosis due to persistent ischemia, hypoxia, and malnutrition. It is mostly seen in people who are bedridden for a long time. 2. Staging: Stage 1: belongs to the early stage, the local skin is intact, but there will be red spots that do not turn white when pressed. Stage 2: part of the skin will be missing, manifesting as shallow open ulcers, or complete or open broken plasma blisters, with the appearance of translucent or dry ulcers without putrefactive flesh. Stage 3: There is ulcer formation on the surface of the skin, which can be superficial up to the subcutaneous fat layer and deep enough to reach the bone tissue. Stage 4: The whole layer of skin tissue is missing with exposure of bones, tendons or muscles, which is visible to the naked eye and can be directly touched. 3. Prevention: first of all, to avoid prolonged local pressure, for long-term bedridden patients must be turned over once every two hours or change position, massage the pressure area; in addition, to make the patient’s skin as clean and dry as possible, and timely treatment of incontinence of urine and feces or excessive perspiration, to reduce the local moisture impregnation; at the same time, we should also keep the bed surface flat, neat, soft, and change the clothes diligently.