Numbness of the head of the thumb may be caused by peripheral neuropathy of the thumb, such as cervical spondylosis, carpal tunnel syndrome, diabetic peripheral neuropathy, etc.; lesions of the cerebral cortex and other causes can also lead to this situation.
1. Cervical spondylosis may be caused by cervical osteophytes or herniated discs, resulting in damage to the cervical 6 and 7 nerve fibers in the brachial plexus nerves that conduct sensation to the thumb, which in turn causes numbness in the thumb.
2. If the upper limb trauma, muscle strain, carpal tunnel syndrome and other lesions, damage to the brachial plexus nerve, median nerve, may also lead to numbness of the thumb.
3. Peripheral neuritis caused by exposure to pesticides, lack of B vitamins, diabetic peripheral neuropathy, etc., can also appear as numbness of the thumb, but there is also numbness and pain in other fingers.
4. Cerebral infarction: if happen to damage to the thumb in the cortical sensory center, there can be numbness of the thumb; but only cause a numbness of the thumb of the cerebral infarction, is extremely rare.
If the numbness of the thumb persists, it is recommended to seek medical treatment as soon as possible, and standardized diagnosis and treatment under the guidance of professional physicians.