Hello and thank you for using HCM. I carefully read your question and I understand your concern. I will try to explain you something. There are different reasons that might cause palpitations. In general they are caused by electrical issues in the heart. It may be just an elevated heart rate above 100/beat for minute that gives you a palpitation or an extra-sistolik beat. This is an electrical impulse generating in a part of the heart that produces an escaped beat that you feel like a palpitation or like a flutter in stomach. Physical or emotional stress, caffeine products might cause increased heart frequency or escaped beats so its mandatory to avoid them. All sow, there are different pathologyes like anemia, thyroid gland problems like hyperthyroidism that might be the cause of fast heart beats and palpitations. When you experience a high frequency, it might be normal to experience palpitation or a fluttering in stomach. If these frequencies/palpiatations are interfering in your normal daily live, If I was your treating doctor I will recommend some simple examinations. I will recommend an electrocardiogram, a cardiac echocardiography and of course a rhythm holter monitoring for 24 h. This is necessary to have a full view of your mean frequencies during day and night. After these, a full blood chek up to exclude anemia or thyroid problems. Doing this examinations helps us understand if it is necessary to do something or not. But if you feel this palpitations occasionally, my opinion is you have nothing to worry about. Hope I was helpful. Wish you good health. Best regards.