<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hey, Im 19 but this has been happening for a long time, though its rare. Out of nowhere, my heart would beat 4-5 times really fast, when it does this it s like I get jolted and it feels really good. Nothing nasty here. I mean like.. it gives me a weird moment where I breathe in and get a bit light headed, then gives me this tinge of a good feeling. NOT talking about love or anything. I could be alone sitting down doing NOTHING and it ll jump at me. I ve been really curious about it.  <response>: Hi, I understand your concern and would explain that your symptoms could be related to anxiety. Anyway, before coming to this conclusion, I would recommend performing some tests: - a resting ECG-complete blood count for anemia-thyroid hormone levels for thyroid gland dysfunction- blood electrolytes for possible imbalance. If all the above tests result normal, you should consider anxiety as the main cause underlying your complaints. Hope I have answered your query. Let me know if I can assist you further. 