There are three main causes of numbness in the hands and feet, as follows: 1. It is possible that there is a cerebral infarction or a precursor to a stroke, resulting in numbness in one limb or hand or foot. This is due to a decrease in the function of the central nervous system of the brain, resulting in numbness in the relevant side of the distribution area. 2, it may be spinal cord cervical spondylosis, which is due to a herniated disc and ligamentous hypertrophy in the cervical spine, resulting in narrowing of the spinal canal and extrusion of the spinal cord in the spinal canal, resulting in numbness in the extremities. 3, it may be neurogenic cervical spondylosis combined with a herniated disc in the lumbar spine The numbness of one upper limb may occur because of the stimulation of the nerve roots formed in the cervical spine, and some of them may show numbness in the hands. After the formation of lumbar disc herniation, the nerve roots are squeezed, resulting in nerve bundle ischemia, and numbness in the feet may occur, especially in the lumbar 4/5 and lumbar 5 sacral 1 disc herniation is more likely to occur.