Muscle pain in the limbs may be caused by physiological factors such as prolonged exercise, but also due to upper respiratory tract infection, osteoporosis and other pathological factors. 1. Physiological factors: if a long time of strenuous exercise or dance training, the body will produce too much lactic acid, lactic acid accumulation can not be quickly metabolized, thus leading to muscle pain in the limbs, or muscle fiber strain, muscle strain in the limbs, there will be limb muscle soreness, pain, reduce the activity of more rest, it can be gradually relieved. 2. Upper respiratory tract infection: patients with upper respiratory tract infection caused by cold or decreased resistance, can cause symptoms such as dry throat and cough, but also because of the infection may cause fever, elevated body temperature, limb pain. 3. Osteoporosis: a metabolic bone disease, mostly seen in the elderly, due to the loss of bone mass, changes in bone structure, patients often feel tired and fatigue, with the progress of the disease, the patient will appear limb muscle and joint pain. Muscle pain in the limbs can also be caused by other reasons, and it is recommended that patients consult a doctor in a timely manner and standardize their treatment to avoid delaying their condition.