<s>[INST] I ve been having irregular heart beats many times a day for about 4 days now... and tonight, a little left-side pain (arm, shoulder, chest) .... my BP seems okay, I think(?) .... 4 hrs ago it was 120/61 and heart rate was 72bpm ..... a few minutes ago, my BP was 112/69 and heart rate was 59bpm .... just wondering if I should be concerned. [/INST] Hello, What's your age, any other risk factors for heart diseases like smoking, family history etc. From the mentioned symptoms doesn't look like the need to be concerned, but should be evaluated.  You should get one ECG done to find out the cause of irregular heart beats. Usually, it occurs due to extra beats which can occur due to smoking, stress, heart diseases, thyroid problems etc. So before going ahead we should have ECG.  Hope this helps you and get back if you have more information to share. </s>