Swollen hands in the elderly may be caused by physiological factors, acute injury, arthritis, contact dermatitis and other factors. 1. Physiological factors: such as sleeping at night in an improper posture, the upper limbs caused persistent compression, resulting in venous return obstruction, will appear in the morning the symptoms of hand swelling, usually can disappear on their own. 2. Acute injury: for example, by external force or serious pressure, resulting in hand injury, such as soft tissue injury or fracture, will lead to localized swelling, accompanied by severe pain, subcutaneous bruising and other symptoms. 3. Arthritis: for example, rheumatoid arthritis, septic arthritis, gouty arthritis, etc. can lead to swelling of the hands, which may be accompanied by redness, morning stiffness, pain, etc., and in severe cases, it may lead to local deformities. 4. Contact dermatitis: contact with allergenic or irritating substances can lead to swelling of the hands, which may be accompanied by itching and tingling. There are many causes of swollen hands in the elderly, it is recommended that long-term or recurring swollen hands of the elderly in a timely manner to the hospital, under the guidance of the doctor to identify the causes and give treatment according to the situation.