Feeling numbness in the arm after getting up in the morning is mainly due to two situations: 1, during the night sleep, the pillow is not suitable, too high or too low, which will lead to abnormal cervical spine physiological curvature, cervical vertebrae parts of the muscles are in a fatigue, tense state, and after a long time, it will form aseptic inflammation foci, and inflammatory metabolite stimulation of the peripheral nerve roots, which will cause numbness of the arm, and also may be the localized Calcification, hyperplasia and fibrous connections, nerve stimulation, nerve bundle ischemia, there will be numbness of the arm. 2, in the night time sleep, because the arm is in a state of compression, after a long time of compression, it will also lead to the muscles and the surrounding soft tissues on the nerve to produce extrusion, such as brachial plexus nerve compression, ischemia, which will lead to numbness of the arm symptoms.