The nipples are always standing up, which means that they are always in an erect state. The symptoms of erect and painful nipples mainly occur in the following situations: 1. Pregnant women, the level of sex hormones in the body of pregnant women will change significantly. The breast tissue is sensitive to the changes in sex hormones and will become engorged, edematous and develop again, resulting in erect nipples and pain. 2, related to menstruation, some women have this symptom during menstruation, while some women have this symptom about a week before menstruation. 3, breast disease If there is a tumor in the breast or a hyperplasia in the breast tissue, it may affect the nipple area and cause erect and painful nipple symptoms.