Numbness and stiffness in the hands may be caused by rheumatoid diseases, in addition to similar symptoms after suffering from cervical spondylosis or muscle atrophy. Rheumatoid arthritis can lead to inflammation in several joints of the hands and feet, because of the local inflammatory reaction, it will secrete all kinds of inflammatory substances to cause adhesion of the joints, which affects the normal sensation, and in the later stage, it will lead to local movement disorders. After suffering from cervical spondylosis, because the herniated intervertebral disc compresses the vertebral artery and the adjacent nerve roots, it will lead to ischemia in the limbs, and also cause the peripheral nerves in the endings of the limbs to be damaged, which will also cause abnormal sensation. Muscle atrophy can lead to the disappearance of muscle fibers, resulting in a reduction in muscle size, leading to various neurological dysfunctions.