Possible causes of gluteus medius pain include muscle strain, myofasciitis, pyriformis syndrome, lumbar disc herniation and so on. 1. Muscle strain: may be in life or work, long-term sitting state, resulting in regular pressure on the gluteus medius muscle, triggering local muscle strain, symptoms of gluteus medius pain. 2. Myofasciitis: Myofasciitis may be caused by repeated strain or trauma, in which the muscle and fascia are repeatedly stretched, resulting in aseptic inflammation. As the gluteus medius muscle is stimulated by the inflammatory reaction, it causes congestion and swelling of the surrounding tissues, which triggers the symptom of gluteus medius muscle pain. 3. Piriformis syndrome: Piriformis syndrome may be caused by cold, exertion, trauma and other factors, which may compress the sciatic nerve and cause pain in the gluteus medius. 4. Lumbar disc herniation: it may be due to long time bending, sedentary, lifting heavy objects and so on and produce lumbar cumulative strain injury, resulting in lumbar disc herniation, which may stimulate the nerve root and spinal cord, and the condition occurs. There may be other reasons for the pain in the gluteus medius muscle, it is recommended to go to the regular hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment under the guidance of the doctor.