The symptoms of soreness in the inner thigh position may be caused by the following reasons: 1. Most commonly, excessive exercise or labor, resulting in minor damage to the soft tissues of the inner thigh, or caused by local inflammation, the muscles of the inner thigh are subjected to prolonged strain, and this symptom may also occur. The sudden increase in local activity will cause the body to produce a large amount of lactic acid, lactic acid is an irritant that can lead to local muscle, fascia and other structures are stimulated, resulting in minor soft tissue inflammation, continuous muscle pull, but also cause local muscle fiber damage, resulting in symptoms of soreness. 2, in this location deep hip joint, hip joint lesions can also lead to local symptoms of soreness . Early stage of hip arthritis, early stage of hip synovitis or early stage of femoral head necrosis will cause localized soreness, which may be aggravated after exertion, and will be relieved after rest.