Pain in the left side of the buttocks even with leg cramps is mostly caused by nerve compression. This situation: first, seen in patients with lumbar disc herniation, after the emergence of disc herniation, compression of the nerve root on the left side, it will cause pain on the left side of the buttocks as well as the leg radioactive, especially when bending activities, the pain will be significantly aggravated. Second, it is seen that the sciatic nerve is compressed in the buttocks, such as pear-shaped muscle syndrome, or pear-shaped muscle injury, resulting in scarring and contracture of the pear-shaped muscle, which will lead to compression of the passing sciatic nerve, causing edema and weakened conduction of the sciatic nerve, resulting in obvious pain in the buttocks and accompanied by obvious cramp-like pain in the left leg. There will also be obvious pressure pain when pressing on the left buttock, and this condition will also appear to have obvious pain aggravation when lifting the leg and moving around.