The symptoms of hamstring pain in one leg may be due to the following reasons: 1. Excessive exertion of the leg, especially when doing activities or labor on one side of the leg similar to kicking a soccer ball, jumping on one leg, etc., is likely to cause injury or inflammation of the muscles and fascia of the leg on one side of the leg, which will lead to pain symptoms in the soft tissues of the leg. In this case, as long as the leg is rested and relaxed, the pain symptoms can be significantly relieved. And fatigue triggered by leg pain symptoms, will not be more than five days; 2, if the leg pain in addition to the existence of back pain symptoms, it is likely to suffer from lumbar disc herniation of this disease triggered by the pain. Herniated lumbar discs can be triggered by twisting and flashing of the waist, and may also be triggered by prolonged bending or maintaining a sitting posture. So patients with this condition, the symptoms of a leg pain, must be alert to the lumbar disc herniation this kind of disease, it is best to go to the regular hospital to confirm the diagnosis and timely treatment.