<s>[INST] I feel great, I feel strong . I have no problem with a good workout. But my heart feels like its quivering every day. It feels like it beats normal but quivers too. I especially feel it when lying in bed. Makes me think is it always quivering and I only notice it when I am not busy. Whats going on with me? [/INST] Thanks for your question on Chat Doctor. I can understand your concern. Since your symptoms are only when you are not doing anything, possibility of stress related symptoms is more. But better to rule out heart diseases like arrhythmia (rhythm disturbances in heart) first. Because arrhythmia can cause similar quivering feeling in heart. So get done ECG, 2d echo and Holder monitoring (24 hour continuous monitoring of ECG). If all these are normal then no need to worry about heart diseases. Avoid stress and tension, be relaxed and calm. Divert your mind from this feeling. Don't worry, you will be alright. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks. </s>