There are physiologic and pathologic reasons for hand drop swelling, and pathologic reasons are common in upper extremity venous thromboembolism, cervical spondylosis, and venous valvular disease of the limbs.
1. Physiological reasons: under normal circumstances, slight swelling occurs when the hand is drooping, and the swelling will subside slowly when the hand is elevated, because the phenomenon is caused by slowing down of blood reflux, which is a normal physiological phenomenon.
2. Pathological causes
(1) Upper extremity venous thromboembolism: when there is thrombosis in the veins of the upper extremity, it will affect the blood return of the upper extremity, and a large amount of blood will be stagnant in the arm, which will cause swelling symptoms.
(2) Cervical spondylosis: Especially patients with neurogenic cervical spondylosis can be accompanied by vasomotor symptoms, such as swelling, lack of sweating and pain in the hands.
(3) Venous valves of the limbs: when the venous valves of the limbs of the upper extremities have problems, the valves are closed incompletely and the return of blood is restricted, so that the blood stagnates in the periphery and swelling of the hands occurs.
Besides, there may be other diseases such as upper arm tumor compressing blood vessels will cause hand swelling.