Pressing the back of the hand index finger numbness in most cases is due to neuritis, cervical spondylosis, insufficient blood supply to the hand and other reasons, the specific causes of the disease should also go to the hospital in a timely manner for examination and diagnosis. 1. Neuritis: when the hand nerve tissue in the innervation range of motor, sensory or autonomic nerve disorders, will cause a series of local diseases, if the hand local tissue damage, can lead to press the back of the hand index finger numbness symptoms. 2. Cervical spondylosis: when the cervical spine around the osteophytes, and compression of the surrounding blood vessels and nerves, causing local tissue sensory conduction abnormalities. 3. Insufficient blood supply to the hand: when long time squeezing or squeezing causes the blood supply function of the hand and arm parts to be abnormal, so that the local blood supply is insufficient. Caused by pressing the back of the hand index finger numbness causes more, when the discomfort symptoms, should go to the hospital in a timely manner for examination and diagnosis, a clear cause, under the guidance of a professional physician for targeted treatment, to avoid serious impact on the body.