<s>[INST] I have a tickling sensation (no pain) in my chest that comes and goes. I feel it in the upper left part of my chest close to my armpit. This has been happening for approximately the last week. It feels somewhat like fluttering, but it seems to be occurring up and to the left of the atrium. I am scheduled for a holter monitor and echocardiogram next week but am obviously very curious in the mean time. [/INST] Thanks for your question on Chat Doctor. In my opinion you are having irregular heart beats (arrhythmia) which give you feeling of fluttering. So you must get done 1. Holder monitoring2. 2D Schooler monitoring is continuous recording of your ECG throughout the day. So any rhythm abnormality can be easily picked up.2D Echo is needed to see any wall motion abnormality and the function of heart. So go and get all these done. Till that time avoid heavy working. </s>