<s>[INST] I have been experiencing a drop in my heart rate, and indigestion for most of the day, it drops down to low 40 s and then goes up to 80 s/ I feel it more when it drops than i do when it is higher. I have a tracker watch on for running so it gives me my heart rate. It feels really weird today, should I be concerned. [/INST] Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. After going through your medical details I understand your concern and I would like to tell you that heart rate is ever changing phenomena depending on your activity level, emotional stress and physiological changes. During running or exercise your heart rate will definitely increase but your resting heart is on lower side which can be normal if you are an athlete but if not then kindly get an ECG and treadmill test done to exclude any heart rhythm disorder. Hope I have answered your query. Let me know if I can assist you further. </s>