Hyperprolactinemia, also known as elevated prolactin, is a condition where the level of prolactin in the bloodstream rises above the normal reference ranges. In women, it can lead to symptoms such as menstrual irregularities and unusual milk production from the breasts (galactorrhea). In men, it may cause issues like erectile dysfunction. However, it is important to note that elevated prolactin levels are considered physiological and normal during pregnancy and the breastfeeding period.