Butt muscle swelling is usually due to poor posture, gluteal myofasciitis, and low back disorders. The cause should be identified in a timely manner. 1. Bad posture. If the patient is in a fixed bad posture for a long time, it will lead to over-exertion of the buttock muscles, which may lead to the accumulation of lactic acid in the buttock muscles, and therefore may cause buttock muscle pain. 2. Buttock myofasciitis. If the patient is cold for a long time and does not pay attention to keep warm, it will often lead to chronic inflammation of the gluteal myofascia, so it will also lead to the symptoms of buttock muscle swelling and pain. 3. Lumbar diseases. If the patient suffers from lumbar diseases, such as lumbar disc herniation, lumbar spinal stenosis and lumbar sprain and other diseases, it will also cause buttock muscle swelling and pain. Female patients with gynecological inflammation can also cause buttock soreness and swelling, if the swelling and pain continue to be unrelieved, you should consult a doctor in time to identify the cause of the disease, and under the guidance of the doctor to give reasonable treatment.