<s>[INST] hi doctor....i am sufering from palpataions since like four months....n i experience them  daily...i dont rememeber if i had a day that i dint experience this feeling...i had all my tests n they are show nothing is wrong.only i have sinus tacycardia...im not taking any medicines.i only want to ask u that do the palpatations lasts for this much long??n if so what am i suposed to do???thank u.waiting for ur answer..mariam binte jalil.. [/INST] Hello! Welcome and thank you for asking on Chat Doctor! Sinus tachycardia could be related to different possible causes: thyroid dysfunction, chronic anemia, anxiety, etc. Have you performed a cardiac ultrasound? I would like to directly review your Holder and cardiac ultrasound report for a more professional opinion. Have you checked your thyroid hormone levels? It is necessary check them, to exclude a possible thyroid dysfunction. If all the blood lab tests (including complete blood count, thyroid hormone levels, blood electrolytes) and your cardiac ultrasound is normal, I would recommend taking low dose of beta blockers to reduce your palpitations. Hope you will find this answer helpful! Kind regards,  </s>