When you get up in the morning and stretch your back, your bones will rattle, which may be caused by physiological reasons such as normal friction between joints, or pathological reasons such as lumbar muscle strain. 1. Physiological reasons: when people get up in the morning to stretch, due to the joints and the joints may produce friction, the phenomenon of bone will ring. 2. Pathological reasons: people in a long time lumbar muscle strain, can cause lumbar vertebrae between the joints of the pressure is too large, can make the joint space narrowing, in the early morning when stretching, will lead to lumbar vertebrae rattling sound. It is recommended that the person who wakes up early and stretches his back when the bones will ring if accompanied by other uncomfortable symptoms, need to go to the regular hospital in a timely manner, a clear diagnosis, standardized treatment under the guidance of the doctor, so as to avoid delaying the condition.