I was recently diagnose with an underactive Thyroid and my doctor ran a blood test and was concerned about my cholesterol levels that are at 245. Now i'm 35 male and active. I really don't have a family history of high Cholesterol. He believes my Thyroid is effecting my cholesterol. I've recently started Synthroid to regulate my Thyriod. So in about 2 months we will see if those numbers go down. Funny because when I was first diagnosed with Thyroid problem my total Cholesterol was at 188. When I was told about that that, I went on a perfect diet for 1 month. I'm mean I didn't have 1 oz of any fatty food and drank only water. Furthermore I exercised on a trend mill for 30 minutes, 4 times a week. Then when I was retested and to my surprise my Cholesterol jump from 188 to 245. This happened before I was on any Synthriod medication. Wondering what your thoughts are and have others had their Cholesterol jump from a Thyroid issue?