The main root of the lateral thigh is the femoral trochanter, side sleep pain in this area, there may be the following aspects of the cause: 1, may be side sleep, the femoral trochanter appears long time compression, which leads to local ischemia, and caused by the ischemic pain, generally after turning will relieve the ischemic state, pain can soon be relieved. 2, the femoral trochanter bursitis. The company’s main business is to provide a wide range of products and services to the public.