1．Palpitation - A sensation of rapid or irregular beating of the heart, often associated with anxiety or excitement.

2．Flutters - A sensation of rapid, irregular, or intermittent beating of the heart, often felt in the chest or throat.

3．Throbbing - A pulsating or rhythmic sensation, often felt in the chest or head, that can be caused by excitement, anxiety, or physical exertion.

4．Racing heart - A sudden increase in heart rate, often accompanied by feelings of anxiety or fear.

5．Pounding heart - A sensation of forceful or heavy beating of the heart, often associated with physical activity or emotional stress.

6．Skipped beats - A sensation of missed or skipped heartbeats, often caused by anxiety or an irregular heartbeat.

7．Tachycardia - A rapid heart rate, usually defined as a resting heart rate of more than 100 beats per minute.

8．Bradycardia - A slow heart rate, usually defined as a resting heart rate of less than 60 beats per minute.

9．Arrhythmia - An irregular heartbeat, often caused by an underlying heart condition or medication.

10．Cardiac arrest - A sudden loss of heart function, often caused by a heart attack or other serious medical condition.