Caudal plexus pain clinical foreign body sensation: often feels like a foreign body trapped in the gluteal groove unpleasant and unpleasant feeling. General non-surgical treatment for trauma can be done through anal diagnosis at an early stage to reset the dislocation of the caudal fracture and supplemented with physiotherapy, acupuncture and closure therapy, including closure of the caudal plexus nerve. I. Pathogenesis Mostly due to trauma from a fall on the hip. Pathogenesis 1, trauma: mainly due to direct violence on the sacrococcygeal area in the fall, and it can also be damaged during childbirth. 2, pelvic disorders: gynecological disorders, prostatitis and hemorrhoids are common. 3.Tumor: mainly for sacrococcygeal tumor. 4.Other: such as long-term sitting posture can also cause the sacrococcygeal degeneration and osteophytes. 3, should be differential diagnosis with the following symptoms 1, hip muscle atrophy: hip muscle atrophy is the clinical manifestation of progressive muscular dystrophy in myogenic diseases. 2, gluteus medius paralysis gait: gluteus medius paralysis gait is one side of the gluteus medius lesion, polymyositis, progressive dystrophy, etc. 3, gluteus medius injury: gluteus medius injury is one of the common clinical lesions. The gluteus medius muscle is located on the deep side of the gluteus maximus muscle, starting from the lateral iliac crest and ending at the greater trochanter of the femur.