<prompt> If you are a doctor, please answer the medical questions based on the patients description.I am 45 yrs old and have been having a few instances where my heart started racing and I feel paniced like I might have a heart attack? I went to the docs and I am not overweight 5-11 175lbs and a very active and eat pretty good and myheart is 11767? I have been a bit stressed for work and I do smoke cigs which I have just stopped a few days ago? Is it just stress? I went in and they are doing a complete blood workup to check liverkidneythyroid etc.. My cholesterol was pretty high about 9 months ago 290 but that was taken right after a week long of holiday food in which I ate everything possible that was bad for you and since then I have been good about lowering my fat and fast food and taking omega3, garlic and super B complex and C. I have no family history of heart or high cholesterol and all have lived into their late 80s -90s?  <response>: Hello dear, Thank you for your question. Usually heart attack presents with severe anterior chest pain that may spread in the surrounding areas. This type of pain usually doesnt go away. So it is safe to say that you have a very low probability of having had a heart attack. The fast heart rate or the feeling of having irregular rhythm may come from different conditions like: thyroid gland disorders, excessive caffeine consumption, smoking or even just stress. Rapid heart rate is also an important symptom of anxiety disorders. Your doctor may suggest running some tests, in order to establish the cause of your complaints hope this helped. Best wishes, 