Often hold the phone will appear hand numbness, because of the following points: 1, often hold the phone will lead to poor peripheral blood circulation, arteriovenous short flow and poor circulation of arteriovenous anastomosis branch. This can lead to numbness and paresthesia in the hand due to inadequate blood supply. 2, often when playing with a cell phone will involuntarily involve the cervical vertebrae of the 2nd-7th section of the neck, which can lead to bulging discs, herniated discs, etc., because of the compression of the cervical vertebrae, which can lead to numbness in the capillaries of the cervical vertebrae and the dominant hand. 3, patients suffering from peripheral neuritis, especially in patients with previous history of diabetes combined with peripheral nerve Patients with a history of diabetes combined with peripheral neuritis, playing with cell phones will lead to numbness of the peripheral nerve radiculitis, so the symptoms of hand numbness will be aggravated.