Pain in the root of the right leg may be caused by the following diseases: 1, the most common is a strain of the ligaments and muscles around the hip joint and thigh, if there has been strenuous exercise, excessive labor or a long time to maintain a fixed posture before the symptoms appear, it may cause pain in the root of the right leg. The pain caused by the injury will restrict the movement of the leg to varying degrees and will aggravate the pain due to the activity. 2. If the middle-aged and elderly people usually have pain when they are not active and resting, when they are lying in bed or sitting on the seat, the pain will not affect the activity at first, but as the symptoms worsen the activity of the right leg is gradually affected, which may be caused by ischemic femoral head necrosis, the patient had better 3. Some patients with herniated lumbar discs may also experience pain at the root of the thigh, which is caused by compression of the lumbar spinal nerve, but most patients will have pain in the lower back.