Symptoms:

Symptoms in men include decreased sex drive, impotence, headache, visual impairment, galactorrhea (secretion of milk, which is uncommon), and symptoms of hypopituitarism (low levels of pituitary function, which result in lowered levels of thyroid or adrenal hormones).

Sexual dysfunction may result from hyperprolactinemia alone or from secondary hypogonadism (low testosterone levels).

Signs and tests:

Signs may include visual field defects, gynecomastia (enlarged breasts), galactorrhea, loss of musculature or body hair, and signs of hypothyroidism or hypoadrenalism.

Tests may show:

• Elevated prolactin
• Low testosterone
• Low FSH and LH
• MRI or CT scan showing pituitary tumor
• Abnormal visual fields