Fluttering heart beats usually indicate a problem with the heart rythym and are called palpitations. There ae various causes of the same like for example too fast or too slow heart beats, irregular heart beats (arrythymias) , panic/anxiety attacks, thyroid issues like hyperthyroidism, low blood hemoglobin : Anemia etc. These need to be evaluated and you need to consult your GP for a examination and tests like ECG, blood pressure, thyroid function and a complete blood count. All the best.
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