Hyperprolactinemia

Hyperprolactinemia: Causes, Symptoms, Diagnosis, and Treatment

Hyperprolactinemia is a condition characterized by abnormally high levels of prolactin in the blood. Prolactin is a hormone produced by the pituitary gland, primarily responsible for stimulating breast milk production after childbirth. However, elevated prolactin levels can occur in both men and women who are not pregnant or breastfeeding, leading to various health issues.

Causes

The most common causes of hyperprolactinemia include:

Pituitary tumors (prolactinomas) 1, 4
Certain medications, such as those for high blood pressure, depression, and nausea 1, 6
Hypothyroidism 5
Chronic kidney or liver conditions 4
Chest wall injuries or irritation 4

Symptoms

Symptoms of hyperprolactinemia can vary between men and women:

In women:

Menstrual irregularities or absence of periods 1, 2
Infertility 2, 4
Galactorrhea (milk production when not pregnant or breastfeeding) 1, 4
Decreased libido 4
Vaginal dryness 1

In men:

Decreased libido 4
Erectile dysfunction 4
Infertility 4
Gynecomastia (enlarged breast tissue) 4
Reduced body hair and muscle mass 4

Both men and women may experience bone loss due to the condition's effects on sex hormone production 4, 5.

Diagnosis and Treatment

Diagnosis of hyperprolactinemia typically involves blood tests to measure prolactin levels. Prolactin levels above 25 ng/mL in women who are not pregnant are considered elevated 1. Additional tests, such as thyroid function tests and imaging studies like MRI, may be performed to identify the underlying cause 5, 6.

Treatment depends on the cause and severity of the condition:

Medication: Dopamine agonists like cabergoline and bromocriptine are commonly prescribed to lower prolactin levels 1, 5.

Addressing underlying conditions: Treating hypothyroidism or adjusting medications that may be causing the elevated prolactin levels 5, 6.

Surgery: In rare cases where medication is ineffective for large pituitary tumors 1, 5.

With proper treatment, most patients with hyperprolactinemia can effectively manage their condition and alleviate symptoms 1, 5.

References:

Columbia University Irving Medical Center: Hyperprolactinemia Clinical Guidelines (https://www.columbiadoctors.org/treatments-conditions/hyperprolactinemia-prolaction-disorder)
Endocrine Society: Hyperprolactinemia (https://www.endocrine.org/clinical-practice-guidelines/hyperprolactinemia)
Serri O, Chik CL, Ur E, Ezzat S. "Diagnosis and Management of Hyperprolactinemia." CMAJ. 2003. PubMed
Glezer A, Bronstein MD. "Prolactinomas." Endocrine Journal
Vilar L, Fleseriu M, Bronstein MD. "Challenges in the Management of Hyperprolactinemia." Frontiers in Endocrinology (https://pubmed.ncbi.nlm.nih.gov/29768629/)
Melmed S, Casanueva FF, Hoffman AR, et al. "Diagnosis and Treatment of Hyperprolactinemia: An Endocrine Society Clinical Practice Guideline." The Journal of Clinical Endocrinology & Metabolism (https://academic.oup.com/jcem/article/96/2/273/2709487)

Hyperprolactinemia

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