I have had a thyroid problem since about a year ago. (This is when they said i had one) well about 5 years ago i was on acutane for my acne if you have ever been on it you know it is a good but bad pill. well i was on it for about 2 1/2 or 3 years i have been off for about 2 years now. they said a had a rare thyroid problem i guess its a kind of disease. they said it was not caused at birth so i was just wondering if maybe that is what could have caused it and maybe some other things that could have caused it Hashimoto's thyroiditis is what they said they think it is. I Also take 100mg of it and my Weight still seems to be a problem do you think maybe i should talk to my doctor about the Weight?