The symptoms of numbness in the arm after lying down may be caused by long-term and local compression, which can lead to ischemia in the arm muscles, thus causing the symptoms of numbness. In addition, stroke hemiplegia or osteoarthrosis can cause similar symptoms. If the patient usually has high blood pressure and abnormal blood lipids, it can cause local vascular spasm, which can lead to vascular sclerosis, which can produce transient cerebral ischemia and lead to numbness in one limb. In addition, osteoarthrosis, such as degeneration of joint cartilage, can cause damage to the nerves around the joints and inadequate nutrition, which can cause numbness in the arm. With neuritis, there is symmetrical pain and abnormal sensations in the body, which are caused by nerve damage. After cervical spondylosis, the degeneration and protrusion of the intervertebral discs can compress the nerve roots, which can also cause numbness in the arms.