The causes of left buttock pain include muscle injury, sacroiliac arthritis, sciatic nerve pain, etc. General treatment, medication and surgery are needed to treat the causes. 1. Muscle injury: For left buttock pain caused by muscle injury, rest should be stopped immediately and cold compress should be applied. For serious muscle strain, tear or even rupture, surgical repair is needed. 2. Sacroiliac arthritis: For sacroiliac arthritis, analgesics such as celecoxib can be used to relieve pain symptoms, and glucocorticosteroids such as methylprednisolone can be used to control inflammation; if deformity occurs, arthroplasty is feasible. 3. Sciatica: For sciatica, non-steroidal anti-inflammatory drugs such as ibuprofen can be used to relieve pain, muscle relaxants such as epirubicin can relieve muscle tension, and glucocorticosteroids such as triamcinolone acetonide can help to relieve the pain quickly; if the condition continues to deteriorate or other conservative treatments are ineffective, surgical treatment can be considered. It is recommended that people with left buttock pain go to regular hospitals in time to clarify the cause of the disease and carry out standardized treatment under the guidance of doctors.