Thigh soreness mostly refers to thigh pain, and the common causes are overwork, trauma, femoral head necrosis, lumbar disc herniation, etc. 1. Overwork: After long time weight bearing, long-distance running, playing ball games and other sports, due to overwork, the accumulation of lactic acid in the muscles, thigh soreness occurs, you can rest appropriately. 2. Trauma: Thigh soreness can also occur due to skin and subcutaneous tissue damage in the thigh when falling. 3. Necrosis of femoral head: Ischemic necrosis of femoral head after the blood circulation of femoral neck is impaired due to prolonged use of hormones, alcohol abuse, trauma, etc., which may cause thigh pain and difficulty in walking. 4. Lumbar intervertebral disc herniation: due to old age, weight bearing, improper posture and other reasons, resulting in degenerative changes in the lumbar spine, herniated intervertebral discs compression of the nerve root, lumbago, thigh pain and other symptoms can occur. Causes of thigh pain are more reasons, may also be related to the leg of the fasciitis, hip synovitis, pyriformis syndrome and other diseases, if the symptoms continue to be unrelieved, it is recommended to consult a doctor in a timely manner, to clarify the cause of the disease, targeted treatment.