Varicose veins in the hands may be caused by exercise, blood circulation disorders, disease factors and so on. 1. Exercise: People who are often engaged in heavy physical labor and do fitness regularly may feel more obvious varicose veins as the muscles of the upper limbs become congested and the venous return is slowed down, which ultimately leads to dilatation of the veins. 2. Blood circulation disorders: People who lose weight excessively suffer from sudden weight loss due to reduced eating and increased exercise. There is less subcutaneous fat on the back of the hand and the dilated veins are easily visible. 3. Disease factors: Narrowing and occlusion of the veins of the upper limbs may lead to varicose veins in the blood vessels of the back of the hands. The occurrence of thrombosis in the veins of the upper limbs can have an effect on blood return and lead to varicose veins in the hands. It is recommended to improve the bad habits, avoid excessive weight loss, found that the back of the hand varicose veins symptoms, it is recommended to timely visit the hospital general surgery, with the doctor to find the cause of the disease, things can be disposed of accordingly.