For the left side of the rib pain is how, the most common cause is the left side of the quarter rib part of the chest wall soft tissue contusion. The most common reason is the left side of the chest wall of the external impact, can also be the left side of the chest wall of the chronic strain, often due to sleeping posture is not appropriate, side lying position of the left side of the chest wall for a long time will cause chest wall contusion, manifested as the left side of the rib area of the pain. The first step in treatment is to correct the sleeping position, avoiding prolonged work or twisting the waist to read, which will aggravate the strain of intercostal muscles. Secondly, conventional non-steroidal anti-inflammatory drugs and muscle relaxants can be used to relieve pain and release muscle spasm.