My mother developed terrible varicose veins in her legs during her pregnancies.
All pregnant women risk developing varicose veins.
So less blood leaves the legs. More blood in the leg veins creates more pressure in them, and they gradually widen. Occupation, your hormones, and your family genetic history can also make varicose veins more or less likely. Avoid standing for long periods of time. Walking is better than just standing because your calf muscles pump the legs and empty the veins.