Hyperprolactinemia is a condition characterized by elevated levels of prolactin, a hormone produced by the pituitary gland. This condition can lead to various symptoms, including irregular menstrual cycles, infertility, and galactorrhea (unexpected milk production). It can be caused by factors such as pituitary tumors, certain medications, stress, or hypothyroidism. Treatment typically focuses on addressing the underlying cause and may involve medication or surgical intervention.