The common causes of hand numbness and swelling pain are keeping a posture for a long time, cervical spine disease, diabetes, carpal tunnel syndrome and so on. 1. Keeping a posture for a long time: it will cause poor blood circulation, which will cause numbness and swelling of the hands, and can be restored after adjustment. 2. Cervical spondylosis: after cervical disc herniation, the herniated material will compress the nerve root of the brachial plexus, which will cause numbness and distension of the hand, usually accompanied by cervical pain. 3. Diabetes: can also cause numbness and swelling of the hand, you can check the blood sugar, diabetes can cause peripheral nerve damage, thus causing numbness and swelling of the hand. 4. Carpal tunnel syndrome: exogenous compression or carpal tunnel lumen becomes small can cause numbness and distension of the three fingers on the radial side. Numbness and swelling of the hand may also be related to other causes, it is recommended to go to the hospital in time to do the relevant examination, find out the cause and then targeted treatment.