i was sitting down and my heart rate goes up to 140, what is wrong?
It's kind of hard to guess if you don't give us some more information, like your age, weight, perhaps a family history of cardiac problems or even if you were under any kind of stress or pressure when this happened?
I would suggest you visit your nearest cardiovascular wellness center. Only a doctor will be able to say for sure what is causing these rapid heartbeats. It could ***this post is edited by moderator *** *** web
addresses not allowed*** or it could be a thyroid dysfunction. There are a number of plausible causes and it is best to get yourself checked up to be on the safe side. Erratic or unusual heartbeats are common and such cases usually have effective treatment options.