Soreness in the inner thighs may be caused by physiological factors such as excessive exercise and cold, or it may be caused by pathologic reasons such as hip joint diseases and lumbar diseases. 1. Physiological factors: long-term training of large exercise may cause anaerobic metabolism or strain of thigh muscles, resulting in the accumulation of lactic acid, oxygen free radicals and other metabolites, which stimulate the peripheral nerve roots, resulting in the symptom of soreness in the inner thigh; in addition, prolonged exposure to cold in the inner thigh area may lead to spasm of the muscles as well as tonic contraction, and the above symptom may also occur. 2. Pathological reasons: when the hip joint is diseased, the pain may radiate to the inner thigh area, resulting in the symptoms of inner thigh pain, such as hip impingement syndrome, femoral head necrosis, etc.; when lumbar disease presses on the nerve root or spinal cord nerves, it may also result in the pain in the innervated area, such as lumbar intervertebral disc protrusion, lumbar vertebrae spondylolisthesis. Soreness in the inner thighs may also have other causes, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.