Other Pituitary Tumors as Causes of High Prolactin Levels
Other tumors arising in or near the pituitary -- such as those that cause
acromegaly or
Cushing's syndrome -- may block the flow of dopamine from the brain to the prolactin-secreting cells.
Hypothyroidism and High Prolactin Levels
Another cause of high prolactin levels is hypothyroidism. Increased prolactin levels are often seen in people with hypothyroidism, and doctors routinely test people with hyperprolactinemia for hypothyroidism.
Breast Stimulation and High Prolactin Levels
Breast stimulation also can cause a modest increase in the amount of prolactin in the blood.
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