There are many reasons for numbness in the thumb. If you often play with cell phones, computers, and prolonged head-down activities, it may be related to the compression symptoms of cervical spondylosis. You can do more neck massage, hot compresses, and more neck upward and downward as well as leftward and rightward movements to help relieve symptoms such as finger numbness and dizziness. Numbness of the thumb may also be related to peripheral neuritis, poor local blood circulation caused by cold, etc. You can soak your hands in hot water to promote local blood circulation, do massage to relieve symptoms, or take vitamin B1, vitamin B12 and other nerve-nourishing drugs. Numbness of the thumb may also be related to peripheral neuropathy or cerebrovascular disease in diabetic patients, and should be treated for the cause, to control blood sugar, blood pressure, blood lipids, and do more aerobic exercise.