What are the causes of high pituitary prolactin levels?

Elevated levels of pituitary prolactin (PRL), also known as hyperprolactinemia, represent a complex clinical issue that may be caused by various factors. Common causes are as follows:

1. Physiological causes include pregnancy and lactation, during which prolactin levels naturally rise to promote breast development. Postpartum breastfeeding also stimulates prolactin secretion, which is a normal physiological phenomenon. Endocrine disorders, such as hypothyroidism and adrenal cortical hyperfunction, may also lead to elevated prolactin levels. Additionally, physical activity, hypoglycemia, or sexual activity can cause temporary increases in prolactin.

2. Pathological causes are more complex and include hypothalamic diseases (e.g., craniopharyngioma, inflammation), pituitary disorders (e.g., prolactinoma), primary hypothyroidism, polycystic ovary syndrome, and autoimmune diseases. Moreover, long-term use of certain medications, such as antipsychotics, antidepressants, antihypertensive drugs, and gastrointestinal prokinetic agents, may also lead to elevated pituitary prolactin levels.

When facing elevated prolactin levels, a comprehensive evaluation and diagnosis should be conducted, considering the patient's medical history, clinical symptoms, and examination results.