The swelling of hands and feet in the morning may be caused by the following reasons: 1. It may be physiological edema, which is caused by genetics in many cases, or it may be caused by unknown reasons. The swelling may be caused by allergic symptoms of the skin of the hands and feet, such as the stimulation of mites in the bed or contact with other allergic substances, resulting in local swelling, usually accompanied by itchy skin. 3. The hands and feet may get cold or frostbite accidentally. The actual fact that you have been exposed to more chemical substances, resulting in inflammation of the peripheral nerves, can also cause swelling and numbness in the hands and feet.