Right after I finished radiation I found that I was very warm for a while. I would break into a sweat very easily and I wasn't on salagen then. A few months later the trend reversed and I was cold all the time (and have remained so the last 18 months) Today it is 85 and I am finally feeling warm. The hypothyroidism was diagnosed about 6 months after treatment ended and it has taken the past 18 months to get my level regulated. Although I test ok now, I am still tired and cold although not as bad as I was before.