I recently noticed this weird feeling in the middle of my chest after long walks or when going up stairs.  Maybe Im experiencing heart flutters.  My blood pressure is perfect although and for the most part pretty good shape for a 40 yr old male.  Could this be caused by stress or something else?
Hello and thank you for using Chat Doctor. I carefully read your question and I understand your concern. I will try to explain you something and give you my opinion. You should know that typical heart pains have some characteristics. They are retro-sternal pains likes quizzing, tightness or heaviness. They last from 5 to 20 minutes and may be irradiated to arms, jaw. These is typical ischemic heart pains. Heart rhythm issues like tachycardia, fibrillation, extra systolic beats might give symptoms like chest discomfort or this weird feeling in the Meade of the chest. But we can not be sure until we do some examinations. If I was your treating doctor I will recommend some examination like an electrocardiogram, a cardiac echo, a full blood analyze, a holder rhythm monitoring and a street test. This helps us to differentiate between real ischemic heart pains or just a random extra systolic beat caused by streets. Hope I was helpful. Wish you good health. Best regards.