Which condition is most likely for a man experiencing erectile dysfunction, decreased libido, and galactorrhea?

The most likely condition for a man exhibiting erectile dysfunction, decreased libido, and galactorrhea is hyperprolactinaemia. Elevated prolactin levels can disrupt normal hormonal balances, leading to the symptoms observed.

In men, increased prolactin can inhibit the secretion of testosterone, which is crucial for libido and erectile function. This leads to a diminished sexual desire and erectile difficulties. Galactorrhea, the inappropriate lactation or breast discharge, is a direct consequence of hyperprolactinaemia, as elevated prolactin levels stimulate breast tissue.

These symptoms together suggest that the underlying issue is related to elevated prolactin rather than other conditions. Pheochromocytoma, while it can cause hormonal changes due to catecholamine excess, primarily results in other physical symptoms such as hypertension and palpitations. Hyperthyroidism can cause sexual dysfunction but typically presents with a different set of symptoms, such as weight loss, anxiety, and tremors. Cushing's syndrome might result in sexual dysfunction as well, but it is usually associated with other hallmark signs like moon facies, central obesity, and skin changes. Thus, the unique combination of symptoms points to hyperprolactinaemia as the most probable diagnosis