The soreness at the root of the thigh may be related to the following reasons: 1, there may be ischemic necrosis of the femoral head of the hip joint. 2, there may be deep vein thrombosis, there are many patients who are bedridden or sitting for a long time, there may be deep vein thrombosis, then cause the deep vein at the root of the thigh to become blocked, this time there will be soreness in this area, and there is obvious swelling. 3, there may be some tendon injuries, such as after the patient has done a wide range of strenuous activities of the hip joint, there may be a strain of the adductor tendon at the root of the thigh. 3.Tendon injury may exist, for example, after the patient has done a wide range of strenuous activities of the hip joint, there may be a strain of the adductor tendon at the root of the thigh, and then it will be sore and swollen. 4.Peripheral nerve lesions may exist, for example, the lateral femoral cutaneous nerve compression or lumbar disc protrusion, resulting in radiating pain and soreness at the root of the thigh. 5.There may be Some local infection, such as skin infection in the thigh root, there may be swelling of the surrounding lymph nodes, or some local swelling, soreness and pain.