Your pituitary gland is the master and commander of all your other glands, and it gets scatter radiation in this whole treatment process. Years after treatment, I found that all my hormones were in the toilet. Obviously the thyroid went completely south since it was in the radiation field, but when my testosterone (the family jewels are far away from the radiated area) tanked, I learned about the pituitary issue. So today I wear daily Anderoderm (testosterone) patches, take synthroid for my thyroid, and see and endocrinologist every 6 months for monitoring the levels of the other hormones we expect to get out of whack as a result of pituitary hypo function. Get EVERYTHING checked at an endocrinologist. Even when you start taking hormone supplements, they need adjusting and changing as time goes by, so retesting initially at 6 months, then annually after the first year is the best plan.