Tight and swollen hands may be caused by tenosynovitis, venous thrombosis and rheumatoid arthritis. 1. Tenosynovitis: patients suffer from tenosynovitis due to long-term overuse of the hand or excessive friction. Typical clinical symptoms of this disease include snapping fingers, accompanied by localized pain, joint limitation and hand tightness and swelling. 2. Venous thrombosis: venous thrombosis is formed due to the accumulation of blood in the veins, and the disease can manifest the feeling of tightness and swelling of the hand. It may be accompanied by significant pain in the hand and fever. 3. Rheumatoid arthritis: Rheumatoid arthritis is an autoimmune disease that affects the finger joints of both hands. It usually manifests itself as symmetrical swelling, tightness and hardness of the hands, which may even lead to deformation of the joints. When patients experience tightness and swelling of the hands, it is recommended that they go to the hospital to receive professional diagnosis and treatment from a doctor.