The swelling of the hand in the morning may be caused by the following reasons: 1. After sleeping in a bad posture for a long time, the local nerves of the hand are compressed and the blood circulation is not smooth, resulting in swelling of the hand in the morning. 2. Shoulder and neck diseases, cervical spondylosis, etc., can cause nerve compression and nerve root damage, which can also cause swelling of the hand in the morning. 3. Rheumatic or rheumatoid diseases can cause autoimmune disease symptoms, resulting in morning swelling and stiffness of the hands. In this case, you should go to the hospital in time to clarify whether there is an autoimmune disease, and give symptomatic treatment.