http://www.medications.com/effect/view/21856 I had a series of racing heart events for a week and went to my doctor. She said it was probably stress and my heart was very strong. They stopped. I went for thyroid tests. My tests indicated I was well within the safety range. I ususally see a woman docto Sun, 16 Dec 2007 14:49:07 -0500 http://www.medications.com/effect/view/21856?item=3480 You probably won't see this because it's been a long time since your post but I just wanted to tell you that Adrenal Insuffiency is common in people who are hypothyroid and when their hypothyroidism is corrected, their adrenals can go havoc causing racing http://www.medications.com/effect/view/21856?item=3480 Sun, 19 Apr 2009 23:10:20 -0400 http://www.medications.com/effect/view/21856?item=19014 I am 42 years old..and just started having problems with racing heart..shortness of breath, these symptoms come on fast. I am on 60mg of Armour and my TSH is still 16.5. I was taking Synthryoid but my joints were hurting really bad. Since I have changed http://www.medications.com/effect/view/21856?item=19014