I have a question regarding post-pregnancy thyroiditis- I had my baby about a year ago- I lost over thirty pounds by my 6 week check up- I continued to lose weight and went under my pre-pregnancy weight of 130 lbs. I was not complaining- however since I stopped breast feeding a couple of months ago I have steadily gained weight. I am training for a marathon and running more than ever- I also use my eliptical machine and do strength training. I am now up to 143 lbs. I have heart palpatations, my skin is a mess, headaches, and fatigue. I had my thyroid level checked when I was working on my masters degree and they said the levels showed hypothyroidism, but I wasn't having any symptoms so they did not treat it. During pregnancy my levels were checked and I guess they were fine. Do my symptoms of weight gain sound like they could be thyroid related?