If you have high level of prolactin, can it go untreated?

What is the cause: If the cause of the high prolactin is concerning or if there are associated symptoms, then it requires treatment. Certain medications (such as Geodon (ziprasidone) listed on your profile) may cause an elevation in prolactin levels may not cause any symptoms if the levels don't go above a certain threshold. If this is the case, then no specific treatment is indicated aside from monitoring.

Yes and no: In general a high prolactin does not need to be treated in itself. Your doctor may want to rule out a prolactin secreting tumor. Also , a chronically elevated prolactin may stop your cycles, and the lack of estrogen from this may increase your risk of osteoporosis.