There may be several reasons for leg pain: 1, trauma, if the lower limbs are hit by external forces or car accidents and other causes of knee pain, you can first consult the hospital to check the knee X-ray to see whether there are fractures. If there is no fracture may be due to trauma caused by local hematoma caused by leg pain, can be given to the Siwei Pu pain, as well as through the Chinese medicine patch, Chinese medicine fumigation, ultrasound drug introduction and other means of physical therapy to relieve the symptoms. 2, too much exercise, a long time without exercise or exercise too much, may cause lactic acid in the leg at the bend of the muscle after a large number of accumulation of pain, can be observed for 2 days, can also be given to the towel heat to relieve the symptoms. 3, osteoarthritis, may be the result of trauma to the knee joint, the knee X-ray, to see if there is a fracture, Osteoarthritis, may have inflammation of the joints at the bend of the leg, resulting in soreness at the bend of the leg, can be given to Sivopur pain, cefaclor capsules anti-inflammatory, and at the same time given to acupuncture, Chinese herbal foot soak, Chinese herbal scrub to relieve the soreness.