I was diagnosed with Hashimoto's Thyroiditits in February. My TSH was 369. I started on 100mcg of Levothyroxine and 25mcg of Cytomel (they Cytomel was only for 2 weeks). After 5 weeks by TSH was down to 14.95, so the doctor increased my dose to 125mcg Levothyroxine. When I was first diagnosed, I had been putting on weight and was up to 158 lbs. After the first month of treatment, I dropped to 147, and now am at 142. Not that I am complaining about my weight, but I am not trying to loose weight, I am not dieting or exercising a lot. My question is, Is it normal to loose weight at first or is this something I should worry about? Thank you for your response.