A hand that is inexplicably swollen can be caused by several reasons: 1. gout, gout can involve the hand, swelling and pain in the finger joints, which can be accompanied by increased skin temperature and skin redness, and the formation of gout stones, which should be diagnosed by checking blood uric acid and taking X-rays of the hand; 2. osteoarthritis, osteoarthritis can also have swollen fingers, accompanied by the formation of bone redundancy, which can be serious. 3. cervical spondylosis, when the cervical spondylosis compresses the nerves, it can also lead to swelling of the fingers, which is caused by the swelling of the hands due to the disturbance of the vegetative nerves, so the X-ray of the cervical spine and MRI should be examined for diagnosis and treatment; 4. venous thrombosis of the upper limbs or lymphatic system diseases that lead to the obstruction of venous return can lead to swelling of the hands, so the vascular ultrasound and angiography of the upper limbs should be examined. In this case, vascular ultrasound and angiography of the upper extremities are required for diagnosis and treatment.