Lateral thigh muscle atrophy is caused by tissue necrosis due to prolonged local compression, resulting in inadequate blood supply to the local muscle. It may also be caused by muscle atrophy due to nerve damage caused by trauma to the patient, resulting in degeneration of function. It may also be caused by peripheral neuritis, chemical reagent poisoning, heavy metal poisoning, drug poisoning, or it may be caused by the presence of brain diseases, such as cortical damage or cerebral edema, cerebral infarction, brain tumor, etc. It is also not excluded that the patient is suffering from diabetes. It is suggested that the patient should visit the hospital for early treatment, and should pay attention to his condition in daily life, and should visit the hospital early if there is a tumor.