People with bruises on the hands usually have dilated veins in the hands. It is mainly seen in men, who are engaged in sports or heavy physical labor for a long time, and are more common in slim people. Generally varicose veins in the upper limbs do not cause too serious pathological consequences, so they do not need special treatment, the main reasons for this phenomenon are as follows: 1, physical reasons, perhaps due to congenital factors, some people are born stronger, the diameter of the blood vessels is thicker; 2, may be due to frequent physical exercise or heavy physical labor, vascular dilation is more obvious, compensatory vasodilation ; 3, generally thinner, the subcutaneous fat on the hands is thinner, so the varicose blood vessels are more easily revealed.