There may be several reasons for pain in the back of the hip: 1. Trauma, if there is a car accident or an external force hitting the hip, it is recommended to consult a regular hospital and check the X-ray to see if there is a fracture. If there is a fracture, it is necessary to look at the location and condition of the fracture, and then decide whether to carry out surgical treatment. If there is no fracture, it may be due to the trauma that causes hematoma in the buttocks, which can be treated with pulse blood circulation capsule to activate blood circulation and remove blood stasis, hot towel or traditional Chinese medicine paste and other physiotherapy methods to accelerate the absorption of hematoma.2. If lumbar herniated disc is serious, it may compress the sciatic nerve, which will cause pain in the buttocks, which can be treated with Celecoxib capsule to relieve the pain or topical Flurbiprofen Babo Cream for analgesia, Mannitol for dehydration, and at the same time, it can be treated with Tuina, Acupuncture and moxibustion, traditional Chinese medicine fumigation, lumbar traction and other methods to relieve pain. At the same time, massage, acupuncture, Chinese medicine fumigation, lumbar traction and other physical therapy techniques can be given to relieve the symptoms. If the symptoms are not relieved, surgery can be performed.3. Sciatic nerve injury, if the sciatic nerve is injured due to trauma or other reasons, it may also cause buttock pain.