Visible hand bruises may be related to physiologic factors such as muscular upper extremities, fair skin, individual differences, etc., or to pathologic factors such as varicose veins. 1.Physiological factors: (1) Upper limb muscularity: due to daily activities, sports exercise, upper limb blood flow increases, superficial veins adaptive expansion, coupled with fair skin, may lead to the appearance of obvious hand bruises. (2) Individual differences: due to individual differences, some groups have rich venous blood flow and higher vascular flow, and some people are thin and have less subcutaneous fat, which may lead to the emergence of obvious hand veins. 2. Pathological factors: mainly due to the upper extremity venous return obstacle, congenital developmental abnormalities and other reasons, often showing venous tortuosity, dilatation, etc., which may lead to the emergence of obvious hand veins. If there are obvious veins in the hands, you can choose to seek medical treatment to identify the cause of the targeted treatment.