Elderly people with leg pain, the most common causes in the following areas: First, sciatica, mostly due to lumbar disc herniation compression of the sciatic nerve and lead to the symptoms of lumbar pain, and along the buttocks radiating to the unilateral lower limbs, along the sciatic nerve route, unilateral lower limb soreness, numbness, pain and other manifestations, mostly in the prolonged standing, prolonged walking triggered by the aggravation of the state of rest or lying down after the symptom can be alleviated. Osteoarthritis or gouty arthritis, most common in the knee joints or both toes joints, sudden redness, swelling, heat, pain and other manifestations. Third, senile osteoporosis, osteoporosis can be seen in the whole body, multi-joint, multi-muscle bones, muscles, joints pain, mostly in rainy days when aggravated, can be alleviated after rest. Acute myositis or double lower extremity vasculitis, mostly seen in the muscle pain of double lower extremities, localized superficial varicose veins, redness and swelling and other manifestations.