Numbness in the right hand when sleeping flat on the back is mainly considered to be caused by cervical spondylosis. Cervical spondylosis is a common modern disease, due to degenerative changes, resulting in the soft tissue of the neck and vertebral body dynamic and static force balance imbalance, resulting in disc protrusion, ligament calcification and other changes, stimulating or compressing the nerve roots of the neck, spinal cord, blood vessels, and then a series of symptoms and signs. Excessive physical work, long-term poor posture, bone degeneration, acute trauma and other causes can lead to cervical spine disease. After suffering from cervical spondylosis, patients are prone to dizziness, cervical stiffness, pain, painful numbness in the hands and other uncomfortable symptoms. If patients suspect that they have cervical spondylosis, they need to go to the hospital to confirm the diagnosis based on the results of physical examination, X-ray examination, CT examination, magnetic resonance examination and neurological function examination reports. Most patients can relieve disease symptoms through non-surgical treatment, such as physical therapy and drug therapy, and patients can take drugs such as ibuprofen, diclofenac and meloxicam under the guidance of a doctor; however, if symptoms are severe, patients need to undergo anterior cervical spine surgery and posterior cervical spine surgery to improve cervical spine stability, relieve spinal cord compression and reduce patients’ symptoms. When sleeping, patients should choose a bed that can maintain spinal balance. In addition, the pillow should be padded under the neck as much as possible when lying on the back, and the pillow should be pressed under the shoulder as much as possible when lying on the side. Be careful not to leave the pillow unoccupied, which may affect the spine.