This is because standing for a long time leads to poor blood circulation in the thigh. Keeping your muscles stretched for a long time will secrete chemicals to stimulate your brain and remind you that it's time to rest. Working people standing for a long time are prone to varicose veins. If possible, after standing for a long time, you can exercise, do tiptoe exercise, and stand on tiptoe to relax joints and muscles, which can better help blood flow to relieve pain and prevent the calf from getting thicker.