One side of the buttocks is full and the other side is sunken due to buttock muscle atrophy, leading to muscle atrophy of the common causes of neurogenic muscular atrophy, myogenic atrophy and wasting muscular atrophy and so on. 1. Neurogenic atrophy: when the nerve root, nerve plexus, peripheral nerves and other injuries, it can cause nerve excitatory impulse conduction obstacles, leading to part of the muscle fiber deactivation, which in turn leads to muscle atrophy. 2. Myogenic atrophy: when the gluteal muscle has prolonged nutritional disorder, ischemia or poisoning, it can cause muscular dystrophy, which leads to muscle atrophy. 3. Wasting muscle atrophy: when some lesions occur in the body, such as malignant tumor, poliomyelitis, autoimmune diseases and other systemic wasting diseases, it leads to long-term inability to move the muscles, which in turn leads to muscle atrophy. When one side of the buttock is full and the other side is depressed, it is recommended to consult a doctor in time to clarify the cause of the disease, so as not to delay the best treatment time.