The raised veins on the back of the hand may be caused by thin body type, blood clots in the upper limbs, varicose veins in the upper limbs and so on. 1. Thin body type: thin people usually have less subcutaneous fat content, which can make the subcutaneous veins more obvious, which is a normal physiological phenomenon and does not need to be dealt with. It can also be seen in tourniquet or rubber band ligation of the upper arm, resulting in venous return obstruction and arterial pulsation still exists, also belongs to the normal phenomenon, mostly seen in intravenous infusion, blood collection. 2. Upper extremity thrombosis: If thrombosis occurs in the upper extremity, it can lead to poor blood circulation in the upper extremity, which may lead to raised veins on the back of the hand. 3. Varicose veins of the upper limbs: due to the dysfunction of the venous valves, it can lead to bruising on the back of the hands, which can be manifested as raised veins on the back of the hands. It is recommended that people with raised veins on the back of the hands go to the hospital in time to clarify the cause, and if treatment is needed, standardized treatment should be carried out under the guidance of the doctor.