A little hand swelling may be caused by trauma, inflammation, heart disease, kidney disease, rheumatic disease, etc. The specific cause of the disease needs to be confirmed by the patient after checking in a specialized hospital. 1. Trauma: the patient’s hand is traumatized, resulting in local soft tissue blood vessel rupture, the hand will be swollen due to bleeding. 2. Inflammation: Inflammation of the patient’s hand, such as osteoarthritis, can lead to local capillary and venous expansion of synovial membrane and ligaments around the joints, which can cause localized swelling. 3. Heart disease: heart disease will involve the whole body, may be due to poor blood circulation in the hands, resulting in swelling. 4. Kidney disease: Kidney disease is serious, mainly due to abnormal sodium metabolism, which will lead to generalized edema and swelling of the hands. 5. Rheumatic diseases: rheumatism will invade the connective tissues and joints of the hands, resulting in synovial lesions, that is, rheumatoid arthritis, the patient is stimulated by the inflammation, the hands will have obvious swelling. Hand swelling can also be seen in other causes, it is recommended to go to the hospital in a timely manner, to clarify the cause of the disease, and then follow the doctor’s instructions for treatment.