<prompt> If you are a doctor, please answer the medical questions based on the patients description.I have a question. if someone were having a very strange sensation in their chest, behind the sternum where the heart would be...the sensation feels like blood gushing through. it s just to weird to describe very well. no pain. no shortness of breath, no lightheadedness... but the beat of the heart feels a little bit off, like it s missing and this gushy feeling almost like when you have chest congestion but in the heart instead. weird I know. not sure what to do. it s probably nothing, but thought I would ask. lasts only about a minute or less. but comes back. does anybody know what this might be? Thank you  <response>: Hello, Anyway, before coming to this conclusion, I would recommend performing some tests, in order to investigate the possible underlying causes: - a chest X-ray study- a cardiac ultrasound and resting ECG-thyroid hormone levels for thyroid gland dysfunction- blood electrolytes. An ambulatory 24-48 hours ECG monitoring would help examine your heart rhythm trends for a prolonged time and exclude possible cardiac arrhythmia. You should discuss with your doctor on the above tests. Hope I have answered your query. Let me know if I can assist you further. Take care Chat Doctor. 