I am a 29 year old female with no history of medical problems. For the last few years, I have been experiencing a feeling like an air bubble bursting in my upper chest, like a thump. But the funny thing is it never makes me burp, it isnt painful, and usually it is like I feel it coming up from the opening between my esophagus and stomach. I dont think it is my heart, but I have read about gastrointestinal problems maybe causing abnormal heart beats? It happens mostly when I have heartburn, but not always. Sometimes it happens several times in a row, sometimes just once, and sometimes I go weeks without it happening, but that is seldom. I do have pretty bad heartburn and acid reflux, I have for years. I have searched all over the net many times looking for anything similar to this but cant find anything. Everything I come across is describing something like this associated with belching or pain, but this causes neither. The bubble just feels like it travels up my esophagus, or maybe in front of my esophagus, bursts, and then there's nothing. If it is gas, it is being released somewhere in my body, not coming out. Does anyone have ANY idea what this is and if it is something I should be worried about?