The veins on the hands may be caused by physiological reasons, or may be caused by varicose veins, abnormal heart function and other pathological reasons. 1. Physiological reasons: with the growth of age, the fat under the skin will be less, and the tissue around the blood vessels will gradually atrophy, resulting in the veins being exposed, which may appear as the phenomenon of veins bulging. 2. Pathological causes: (1) Varicose veins: Long-term physical labor or more activities of the upper limbs can easily lead to obstruction of venous return in the upper limbs and varicose veins, which can be manifested as narrowing and occlusion of the deep veins of the upper limbs, or even deep vein thrombosis, resulting in the emergence of veins on the hands. (2) Abnormal heart function: patients with abnormal heart function, if the emotional control is not good, it is easier to lead to rapid heartbeat, which can cause the symptoms of blue veins on the hands. If you exclude the physiological causes of the veins on your hands, you need to go to the hospital in time to find out the specific causes, and actively cooperate with the doctor for treatment.