Swelling of the right hand in the morning may be caused by rheumatoid arthritis, synovitis, soft tissue injury and other causes. 1. Rheumatoid arthritis: its etiology and pathogenesis are complex and may be related to genetic, infectious, environmental and other reasons. Due to the stimulation of inflammation, there can be fluid accumulation in the joint cavity, synovial hyperplasia, soft tissue edema and other phenomena, which can cause swelling of the right hand in the morning. 2. Synovitis: It may be caused by joint injury, cartilage degeneration and other reasons. When synovitis occurs in the right hand, due to the stimulation of inflammation, joint swelling, pain and other phenomena, which can cause swelling of the right hand in the morning. 3. Soft tissue injury: the right hand soft tissue injury caused by collision, extrusion and other reasons. It can be accompanied by skin breakage, localized swelling, bleeding, pain and other symptoms. If your right hand is swollen in the morning, you should go to the hospital in time and follow the doctor’s instructions to avoid delaying your condition.