<s>[INST] I am having Heart Palpitations from last 3 or 4 months. Already have all the Tests done. Blood Tests were normal, ECG has been done thrice but normal, Stress Management Test was noraml and even I had this Holter meter up for 24 hours but everything was normal. I want to mention here that I am having Nasal Polyps which sometimes prevent me to breathe from nose (sinusitis). I do smoke as well. Any suggestions. [/INST] Hello, Nasal polyps could be related to the tachycardia, especially if you have sleep apnea. For this reason, I would recommend performing respiratory function tests for possible obstruction, an arterial blood gas analysis, and a polysomnogram to exclude possible sleep apnea. In such case, you should consult with the ENT specialist in order to undergo surgery. I would also recommend checking thyroid hormone levels for possible thyroid dysfunction. Hope I have answered your query. Let me know if I can assist you further. </s>