Every day when you get up from sleep your hand is numb, there are generally two cases: the first is vasculitis, the second is caused by cervical disc herniation compressing the nerve. For the first condition, you can check the pancytopenia test, which is to press the finger nail with your hand, wait for the red color to disappear, and then release the finger to see the time for the red color to return, usually <2s in normal people, >3s is considered insufficient blood supply, this condition can be used to determine whether there is vasculitis, and patients with vasculitis also have a history of smoking. The second condition can be examined by cervical spine MRI to determine whether there is a cervical disc herniation compressing the nerve, and after a clear diagnosis, further treatment can be carried out according to the diagnostic results.