Soreness in the inner thighs may be caused by over-exercise, hip joint diseases, lumbar spine lesions and vascular diseases. 1. Excessive exercise: when the patient is over-exercised or engaged in heavy physical labor, it may lead to minor injuries to the soft tissues of the inner thighs, resulting in soreness of the inner thighs. In addition, excessive exercise will lead to prolonged pulling of the inner thighs, which may also cause the body to produce a large amount of lactic acid, which will stimulate the local muscles to cause symptoms of soreness. 2. Hip joint diseases: common hip joint diseases include osteoarthritis of the hip joint, rheumatoid arthritis, ischemic necrosis of the femoral head, etc. Hip joint diseases can also lead to prolonged tension, spasm and ischemic state of the inner thigh muscles, thus triggering muscle strain, soreness, pain and other sensations in the inner thigh. 3. Lumbar spine lesions: when the patient suffers from lumbar spine diseases such as herniated disc or spinal stenosis, the nerves innervating the inner thighs may be compressed, leading to soreness and swelling of the inner thighs. 4. Vascular disease: when patients have venous embolism or arterial inflammation, blood circulation to the inner thigh will be impaired, resulting in inner thigh pain. It is recommended that patients seek medical examination in time to clarify the cause of the targeted treatment, pay attention to rest in life, avoid strenuous exercise or heavy labor, and also pay attention to leg warmth, avoiding cold and so on.