Lately I have a very rapid heart rate and my Dr. said it could be a thyroid problem so I had some blood work done; I haven't gotten the results back yet though. But I know very little about thyroid problems and I don't even know which thyroid problem to ask about, so I guess I will ask a question in general. What types of thyroid problems are there and what are the symptoms? And if a thyroid problem is present, how is it treated?