The swelling of the hand in the morning may be caused by the following reasons: 1, it is possible that when sleeping, the hand is cold, or the hand is pressed by the limb for too long and the local blood circulation becomes poor, resulting in swelling, in this case get up and move around to promote the blood circulation of the upper limb, the local swelling will naturally disappear slowly; 2, it may be caused by skin allergy of the hand The swelling may be caused by mites stimulating food or mosquito bites on the bed sheet or bedding when sleeping, resulting in local swelling, skin flushing, itching and other symptoms; 3, it may be caused by cervical spondylosis, some degenerative changes in the cervical spine, compression of the nerve roots of the upper limbs will also appear in the morning after waking up, after the neck activity will pull the nerve roots and abnormal sensation of the nerves in the hands, but also It may also be the reason for hand swelling.