Butt muscle pain may be caused by strenuous exercise, or it may be caused by sciatica, muscle strain and other diseases. 1. Strenuous exercise: If you have been doing strenuous exercise for a long time, a large accumulation of local lactic acid may cause pain in the buttock muscles. 2. Sciatica: it is persistent or paroxysmal pain in the sciatic nerve, and the etiology may be related to osteophytes, spinal stenosis, and pyriformis muscle spasm. Dull pain, tingling, and other symptoms may occur locally, accompanied by numbness, mainly in the buttocks, the back of the thighs and other parts of the body. 3. Muscle strain: it is a disease of excessive stretching or contraction of muscles, resulting in their tearing or rupture, the cause of which may be related to factors such as overstretching of muscle fibers and direct traction force on muscles. Symptoms such as muscle pain, bruising or swelling of the skin may occur. If a muscle strain occurs in the buttocks, it may lead to buttock muscle pain. There are more causes of butt muscle pain, after excluding physiological factors, it is recommended to go to regular hospitals for medical examination to clarify the cause and standardize the treatment.