Thumb numbness is common in two types of diseases: first, cervical spondylosis: and it is nerve root type cervical spondylosis, diagnosis is based on CT or MRI, which can clarify the diagnosis of cervical spondylosis. Second, peripheral nerve lesions, the second type of disease is common in two cases: 1, the degeneration of the median nerve, usually occurs in the carpal tunnel compression, that is, the wrist of the place, clinically known as carpal tunnel syndrome, the main manifestation of numbness of the thumb, often also accompanied by numbness of the finger. Through the carpal tunnel of the nuclear magnetic or color ultrasound, can be relatively quick to clarify the site of the lesion and diagnosis. 2, the superficial branch of the radial nerve compression syndrome, will also appear thumb numbness, but mainly in the dorsal side of the thumb numbness. Therefore, this disease should be specific to see whether the numbness of the thumb appears in the palm of the hand on that side, or in the back of the hand on that side, this description is quite critical.