Cervical spinal stenosis of 5mm is a serious condition and prompt medical attention is recommended to avoid irreversible damage. Under normal circumstances, the internal diameter of the cervical spinal canal, including the sagittal and transverse diameters, are of a certain size to accommodate the tissues in the spinal canal. If the sagittal diameter is less than 12mm, it suggests relative stenosis of the spinal canal, and if it is less than 10mm, it suggests absolute stenosis of the spinal canal. If the cervical spinal canal diameter is 5mm, it is a serious condition. In cervical spinal stenosis, due to the compression of the nerve and spinal cord, pain, numbness, motor and sensory dysfunction of the limbs may occur. If the stenosis is severe, conservative treatment is generally ineffective and surgery is required to relieve the compression of the spinal canal. If cervical spinal stenosis of 5mm occurs, it is recommended to actively consult the doctor and follow the doctor’s instructions for reasonable treatment to promote the disease to recover as soon as possible.