Prolactin is a peptide hormone secreted by the pituitary gland, also known as lactogen, and there is nothing wrong with a high prolactin level. The main reasons for high prolactin are as follows: a. Pituitary tumors, which can secrete prolactin and can be combined with increased secretion of other pituitary hormones, are also known as pituitary prolactinomas. Idiopathic hyperprolactinemia, in which some patients do not have pituitary tumors but simply show increased prolactin levels, is called idiopathic hyperprolactinemia. Third, elevated prolactin levels can occur during pregnancy and lactation, as well as after miscarriage and induction of labor. Prolactin is a stress hormone, and exercise and sex can also lead to increased prolactin levels. Some drugs, such as birth control pills and chlorpromazine, can also lead to increased secretion of hormones by the pituitary gland, so it is not a problem to have a high prolactin level.