Re: Can synthroid cause breast tenderness
Your "dose" of 25 mcgs isn't enough to accomplish what you want to happen; that is, to increase your thyroid hormones. It's considered a "non-dose". It may be ok as a starting dose, but it has to be increased to at least 50 within a few weeks. I hope your current MD will be open to that.
What happens is that the 25 mcgs is just enough to tell your pituitary to stop releasing as much TSH, but it isn't enough to replace the hormones that were missing before you took anything at all. The end result is you lose more thyroid hormones than you gain.
Any changes in any of the hormones can cause breast tenderness. When a person is hypothyroid, more prolactin is released into the bloodstream, and that can cause tenderness and/or enlargement.
The TSH level isn't enough to go by. My suggestion is to have your FT4 and FT3 levels tested to see if they're high enough. They probably aren't, and if they aren't, a dose increase is surely warranted.
Last edited by midwest1; 02-27-2007 at 08:51 AM.