Side sleep hip pain has the following reasons: 1, suffered from lumbar disc bulging or lumbar disc herniation patients, when the side sleep to keep a longer period of time will be compressed to the nerve, nerve pathway pain, such as compression to the sciatic nerve after the sciatic nerve channel is issued from the lumbar region, through the buttocks has been to reach the back of the thighs and calves anterior, so the side sleep compression to the sciatic nerve will appear at the buttocks. 2, side sleeping hip pain may also be caused by skin infection in the hip area, when side sleeping pressure to the infected area will lead to pain. 3, there may be boils or lumps in the hip area, which can cause pain when squeezed. 4, side sleeping hip pain may also be caused by incorrect posture for a long time, when side sleeping pressure to the local nerves in the hip will lead to pain. When sleeping on the side presses the local nerves in the buttocks, it will lead to pain, which can be significantly relieved by adjusting the posture.