Double lower limbs are far away from the heart, because standing for a long time itself the effect of gravity will increase the burden of venous return, the venous return is slow or even venous return obstacle, it will cause the swelling of the calf, itself has a direct relationship with the long time standing. Soak your feet in hot water before going to bed at night to promote the blood circulation of the whole limb, and elevate your legs above the heart to favor the venous return, and the swelling should be well relieved when you get up in the next morning. At the same time, you should avoid standing for a long time during the day and wear a pair of anti varicose vein stockings to reduce the swelling of calves. If the swelling is not relieved by these methods, it is necessary to go to the hospital to have a vascular examination, such as an ultrasound of the blood vessels, as it is possible that the blood vessels themselves are diseased.