A patient presents with erectile dysfunction, reduced facial hair, and galactorrhea. What is the most probable diagnosis?

The presentation of erectile dysfunction, reduced facial hair, and galactorrhea strongly indicates hyperprolactinemia.

Erectile dysfunction can occur due to hormonal imbalances, and in this case, the likely cause is elevated levels of prolactin, which can inhibit testosterone production and impair libido. Reduced facial hair suggests a deficiency in androgens, which aligns with the impact of high prolactin levels on testosterone synthesis.

Galactorrhea, or the inappropriate lactation not associated with childbirth, is a hallmark symptom of hyperprolactinemia. This condition results in an excess amount of prolactin, often due to a prolactinoma (a type of pituitary tumor) or other factors that may increase prolactin levels significantly.

The other options do not fit this clinical picture as accurately. For example, Cushing's syndrome typically presents with features such as weight gain, hypertension, and skin changes rather than the symptoms observed in this patient. Pheochromocytoma usually manifests with symptoms related to catecholamine excess, such as hypertension, palpitations, and sweating. Hyperthyroidism might lead to a range of symptoms including weight loss and tremors, but galactorrhea is not character