The common clinical causes of hand swelling in summer are mainly the following: a. Patients with renal insufficiency can eat more water in summer because of hot weather, while the body’s ability to excrete urine is significantly reduced, which can cause excess water to accumulate in the joints of the extremities, resulting in swollen hands. Patients are recommended to strictly limit water intake, actively improve kidney function, strengthen diuresis and promote water excretion in the body to relieve hand swelling symptoms. In summer, if the water intake is low and the blood in the body is sticky, venous thrombosis can be formed in the upper limbs, causing obstruction of venous return and swelling of the hands. It is suggested that patients should improve vascular ultrasound examination to clarify the specific site of thrombus, which can be done by subcutaneous injection of low-molecular heparin, intravenous application of hemosiderin, oral aspirin and other drugs to promote local thrombus dissolution and metabolism, restore blood flow and improve the symptoms of hand swelling.