In principle, pregnant women can use the sauna. In fact, it can have a positive effect on both the pregnancy and the birth. Women who regularly use the sauna can continue to do so throughout their pregnancy. Women who are pregnant but have never used a sauna before should wait until the fourth month of their pregnancy. This is because many pregnancies miscarry during the first three months. Avoiding the sauna simply means avoiding a guilt trip if the pregnancy were to end in this way following the new experience. Some people voice their concern about vein health. Hormonal changes during pregnancy can sometimes lead to varicose veins. Where this is the case, the veins generally return to normal after the birth. However, whether pregnant or not, varicose veins alone should not hinder people from using a sauna.