What Causes Elevated Prolactin Levels?
Aug 13, 2020
Source: Cainiu Health
Dr. Chen Yunmei
Introduction
What Causes Elevated Prolactin Levels?
1. **Drug-related factors**: For example, oral contraceptives can stimulate the pituitary gland to secrete more prolactin while suppressing gonadotropin secretion.
2. **Physiological factors**: Such as pregnancy or the postpartum lactation period in women; excessive emotional stress or intense physical exercise may also contribute.
3. **Disease-related causes**: Including pituitary tumors, hypothalamic disorders, and primary hypothyroidism.
Prolactin—also known as mammotropin or lactogenic hormone—is a protein hormone secreted by the acidophilic cells of the anterior pituitary gland. Its primary functions include promoting mammary gland development and growth, stimulating and maintaining lactation, and facilitating the formation of luteinizing hormone (LH) receptors on ovarian follicles. So, what causes elevated prolactin levels? The following section addresses this question.
What Causes Elevated Prolactin Levels?
1. Drug-Related Factors
Elevated prolactin levels may result from medication use. For instance, oral contraceptives can increase pituitary prolactin secretion while suppressing gonadotropin release, thereby disrupting ovarian function and impairing normal follicular development, ovulation, and fertility. Additionally, prolonged use of reserpine, chlorpromazine, morphine, and other drugs may interfere with dopamine synthesis, absorption, and metabolism, leading to hyperprolactinemia. Furthermore, physical exhaustion and trauma may also trigger increased prolactin secretion.
2. Physiological Factors
Elevated prolactin levels may occur due to physiological causes. For example, during pregnancy or the postpartum lactation period, excessive emotional stress or intense physical exercise may transiently elevate prolactin levels in women. Therefore, maintaining psychological calmness is recommended to help prevent such elevations.
3. Pathological Causes
(1) Pituitary Tumors
Elevated prolactin levels are commonly associated with various pituitary tumors in women. Typical symptoms include breast tenderness, galactorrhea, oligomenorrhea, and amenorrhea.
(2) Hypothalamic Disorders
Diseases affecting the hypothalamus or adjacent structures may reduce production of prolactin-inhibiting factor (PIF), or increase secretion of thyrotropin-releasing hormone (TRH) and prolactin-releasing factor (PRF), resulting in hyperprolactinemia.
(3) Primary Hypothyroidism
When thyroid function declines, the hypothalamus detects insufficient thyroid hormone secretion and responds by markedly increasing TRH production. While TRH stimulates thyroid-stimulating hormone (TSH) release from the pituitary, it simultaneously promotes excessive prolactin secretion, potentially causing galactorrhea.
The above outlines the main causes of elevated prolactin levels. We hope this information proves helpful.
