Butt with thighs and soreness and swelling, this situation, to consider lumbar disc herniation, pear-shaped muscle syndrome, etc., as follows: 1, lumbar disc herniation: when the protruding disc tissue compression to the spinal nerve root, there will be sciatic nerve pain, including buttocks with thighs of the pain, and at the same time, can be radiated to the calf as well as the foot. 2, pear-shaped muscle syndrome: pear-shaped muscle syndrome is the essence of the same Piriformis syndrome: the essence of piriformis syndrome is also sciatic nerve pain caused by sciatic nerve compression. Sciatic nerve pressure is mainly in the lower part of the pyriformis muscle, due to the abnormal muscle fiber proliferation of the pyriformis muscle, which can make the sciatic nerve outlet pressure, thus causing pain in the buttocks, the back of the thighs, and can be radiated to the calves and feet.