Pain in the outer thigh, which is obvious when walking, is a typical manifestation of soft tissue injury around the hip joint, which is usually caused by sprains, contusions, falls, and trauma. However, if the pain is unexplained, it may be caused by chronic injury. Chronic injury refers to the injury caused by usual exertion, such as frequent walking, running and jumping, repeated mechanical movements of the hip joint, or professional sports training or strength training, etc., which can lead to pain in this location. This location is mainly muscles, fascia and other soft tissues, and once these structures are damaged, the pain will be aggravated by leg activities. If the pain is aggravated by cold stimulation, and the pain is felt in varying degrees when the joint is not active, it may also be caused by hip joint diseases, such as hip synovitis, bursitis, etc.