Feeling numbness in the arms after waking up in the morning is mainly due to two conditions: 1, during night sleep, the pillow is not suitable, too high or too low, which will lead to abnormalities in the physiological curvature of the cervical spine, the muscles of the cervical spine area are in a state of fatigue and tension, and after a long time, a sterile inflammatory lesion will be formed, and the inflammatory metabolites will stimulate the surrounding nerve roots, which will cause numbness in the arms, or there may be a local Calcification, hyperplasia and fibrous connections, stimulation of the nerve, ischemia of the nerve bundle, will lead to numbness in the arm. 2, during sleep at night, because the arm is in a state of compression, after a long time of compression, will also lead to muscle and the surrounding soft tissue to produce extrusion of the nerve, such as the brachial plexus nerve compression, ischemia, will lead to the symptoms of numbness in the arm.