Prolactin is a hormone secreted by the pituitary gland in the brain. In women, this hormone plays a crucial role in promoting mammary gland development during pregnancy and milk production after birth. For this reason, prolactin is also known as the milk hormone.

In men, elevated prolactin levels, if higher than normal, can have various effects. High prolactin levels can lead to decreased testosterone levels, potentially leading to decreased libido, decreased sperm quality, and even infertility.

Under normal circumstances, prolactin levels in men are low and do not have a negative impact on sexual function. However, high prolactin levels can cause hormonal imbalances and lead to such effects.

Abnormally elevated prolactin levels can be associated with various conditions, including pituitary gland problems, tumors, or other health issues. These conditions should be evaluated by a doctor and treated as needed. Treatment may include medications or other medical interventions, depending on the underlying condition and symptoms. Once prolactin levels are restored to normal, symptoms are expected to improve and potential side effects are expected to diminish.

What is the prolactin hormone?

Prolactin is a hormone secreted by the pituitary gland. Its primary function is to mature the mammary glands starting in the eighth week of pregnancy, preparing the expectant mother for milk production. Prolactin levels remain high throughout pregnancy and the postpartum period, supporting milk production. It also triggers ovulation and, consequently, the menstrual cycle.

High levels of the hormone prolactin are responsible for preventing postpartum menstruation and preventing further pregnancy during pregnancy and breastfeeding. Prolactin temporarily prevents further pregnancy by inhibiting the release of FSH and GnRH hormones.

Prolactin, a hormone found in men, can affect sexual desire. It also plays a role in sperm production in men. However, high prolactin levels can cause problems such as decreased libido and decreased sperm quality.

In non-pregnant women, high levels of the hormone prolactin can lead to problems such as irregular menstrual periods and breast milk discharge. In rare cases, low prolactin can lead to insufficient milk production, slowed or stopped ovarian function, and in men, premature ejaculation (premature ejaculation) and erectile dysfunction.

Abnormal changes in prolactin levels can often be associated with pituitary gland problems or hormonal imbalances. In these cases, doctors evaluate prolactin levels and initiate treatment if necessary. This can help normalize hormone levels and control symptoms.

What does high prolactin mean?

High prolactin levels mean higher than normal levels of the hormone prolactin in the blood. Normal levels of prolactin range from approximately 15 to 25 µg/L in women and approximately 5 to 10 µg/L in men.

High prolactin levels are considered normal during pregnancy and the postpartum period, as they support milk production during these periods. However, elevated prolactin levels outside of pregnancy or the postpartum period may be due to the pituitary gland secreting more prolactin than normal. This suppresses the production of FSH and GnRH hormones, disrupting the normal cycle of these hormones and potentially halting egg production. This can lead to problems such as inability to conceive and irregular menstrual periods. It can also lower estrogen levels.

High prolactin levels can also cause low testosterone levels in men. This can impair sexual function and sometimes lead to symptoms such as breast enlargement.

Symptoms of high prolactin may include:

• Presence of pregnancy
• Clear or white discharge or milk discharge from the breast outside of pregnancy
• Low estrogen and progesterone levels
• Irregular or absent menstrual periods
• Vaginal dryness
• Infertility
• Breast enlargement in men
• Erectile dysfunction
• Sudden hair loss in men
• Symptoms such as headache and visual disturbances due to a pituitary mass

High prolactin levels can be due to a variety of underlying causes, so it's important to consult a doctor for diagnosis and treatment. Treatment aims to lower prolactin levels and alleviate any symptoms. Depending on the underlying condition, medication or surgery may be necessary.

What causes high prolactin?

High prolactin levels, or hyperprolactinemia, is the presence of higher than normal levels of the hormone prolactin in the blood. While high levels of prolactin are naturally produced during pregnancy and breastfeeding, high prolactin levels can be a sign of various health problems if the woman is not pregnant or has not breastfed.

Factors that cause high prolactin levels include:

• Pituitary tumors: Benign tumors in the pituitary gland (prolactinomas) can increase prolactin levels. Microadenomas (smaller than 1 cm) and macroadenomas (larger than 1 cm) can cause elevated prolactin levels. These tumors are usually treated with medications, or if they are large, surgery may be necessary.
• Hypothyroidism: If the thyroid gland is underactive, an increase in prolactin levels may occur due to the effect of TRH hormone, which secretes thyrotropin.
• Stress and sleep problems: Situations such as stress, insomnia, and excessive exercise can increase prolactin levels.
• Side effects of medications: Some antidepressants and other medications can increase prolactin levels.
• Using tight underwear: Continuous use of tight underwear can put constant pressure on the breasts and increase prolactin levels.
• Breast stimulation: Constant breast stimulation, such as checking the nipple for milk, can increase prolactin levels.
• Other causes: Various diseases such as lung cancer, breast trauma, endocrinological problems, unbalanced nutrition, and anorexia can also cause increased prolactin levels.

Abnormally elevated prolactin levels can be due to a variety of underlying conditions and should generally be evaluated by a doctor. Treatment aims to lower prolactin levels and control symptoms. Medications, hormone therapy, or surgery may be necessary, depending on the underlying cause. Therefore, it is important to consult a doctor if you experience abnormal prolactin levels.

What causes high prolactin?

High prolactin levels, or hyperprolactinemia, is a condition characterized by high prolactin levels outside of pregnancy. This can cause different symptoms in men and women:

In women:

• Irregular or cessation of menstrual periods: High prolactin levels can cause changes in menstrual patterns and may lead to cessation of menstrual periods.
• Infertility: High prolactin levels can affect ovarian function and reduce the chances of pregnancy.
• Decreased sexual desire: As a result of hormonal changes, a decrease in sexual desire may occur.
• Milky or clear-white discharge from the nipple: Milky or white discharge may come from the nipple even though there is no pregnancy.
• Vaginal dryness: Hormonal imbalances can cause vaginal dryness and pain during intercourse.

In men:

• Low libido: High prolactin levels can cause a decrease in libido (sexual desire).
• Erectile dysfunction: High prolactin levels can lead to erectile dysfunction.
• Infertility: It can cause infertility by affecting sperm production.
• Loss of body hair: Abnormal hair loss or loss of body hair may occur.
• Rarely, nipple discharge: Hyperprolactinemia can rarely cause nipple discharge in men.

Additionally, high prolactin levels can cause headaches and vision problems. This may be caused by enlargements in the pituitary gland, which can press on the optic nerve, causing headaches and vision problems.

The symptoms caused by high prolactin can vary from person to person and can vary in severity. However, if you experience any one or more of these symptoms, it's important to consult a doctor and have the necessary evaluation. Treatment typically aims to lower prolactin levels through medications or surgery, depending on the underlying cause.

How is high prolactin diagnosed?

• Evaluation of the patient's complaints: A specialist physician will listen to the patient's complaints and perform a physical examination. These may include breast enlargement and pain, loss of sexual desire, infertility, headaches, vision problems, irregular or cessation of menstrual periods, and nipple discharge or milk.
• Anamnesis: A detailed history is taken from the patient. Information such as medications used, current stress factors, and health history should be shared with the physician.
• Blood test: A laboratory test measures prolactin levels by taking a blood sample. This test is usually performed in the morning, as prolactin levels are typically higher at this time. Additionally, breast stimulation should be avoided, sexual intercourse should be avoided, and the patient should be well rested before the test.
• Hormonal testing and radiological imaging: When elevated prolactin levels are detected, hormonal testing (such as thyroid function tests) can usually be performed to determine the cause, and radiological imaging (usually magnetic resonance imaging (MRI)) can be used to examine the pituitary gland.

Based on the results of these tests and examinations, the physician attempts to determine the underlying cause of elevated prolactin. During this process, the specific diagnostic method may differ for each patient. Diagnosing and determining the cause of elevated prolactin may require a series of tests and evaluations. Therefore, the physician determines the appropriate diagnostic method based on the patient's condition and symptoms.

How is high prolactin treated?

Treatment for high prolactin begins with identifying the underlying cause. Treatment is directed at treating the underlying condition causing hyperprolactinemia. Treatment options may include:

• Stress management and lifestyle changes: Lifestyle changes such as reducing stress, regular sleep, a balanced diet, and using comfortable underwear can affect prolactin levels.
• Medication: Pituitary tumors, such as prolactinomas, are usually treated with medications. Dopamine agonists (such as bromocriptine or cabergoline) are often used. These medications can reduce tumor size and normalize prolactin levels by reducing prolactin release from the pituitary gland.
• Surgery : Rarely, large pituitary tumors or tumors that do not respond to medication may require surgical removal. Surgery can remove the tumor and restore normal pituitary function.
• Radiotherapy: In very rare cases, radiotherapy may be considered for tumors that do not respond to medication or surgery. This can help shrink the pituitary tumor.

Treatment may vary depending on each patient's condition and medical history.

What is low prolactin and how is it treated?

Low prolactin refers to a condition where the prolactin hormone levels are lower than normal. This condition is generally rare and may be caused by problems with the pituitary gland. Possible causes of low prolactin include:

• Hypopituitarism: A condition characterized by a general decline in pituitary gland function. In this condition, levels of several pituitary hormones may be low, including prolactin.
• Medications: Some medications, especially those that contain dopamine, amphetamines, or bromocriptine, can lower prolactin levels.
• Immune system problems: Problems with the immune system can cause low prolactin.
• Other hormonal diseases: GH (Growth Hormone) deficiency and some hormonal diseases that cause excessive dopamine release can lead to low prolactin.

Treatment for low prolactin depends on the underlying cause. Once pituitary problems or other hormonal imbalances are identified, appropriate treatment methods are selected. Treatment generally involves controlling or treating the contributing factors. For example, in the case of hypopituitarism, the goal is to replace the deficient hormones or address other pituitary problems.

Low prolactin is a rare condition and can vary from patient to patient. Therefore, treatment options and procedures should be determined by an endocrinologist or specialist. The doctor's recommendations and prescribed treatment plan will focus on improving the patient's prolactin levels and treating the underlying condition. Regular checkups are essential for a healthy lifestyle.