<unk> s are heartbeat sensations that feel like your heart is pounding or racing. You may simply have an unpleasant awareness of your own heartbeat, or may feel skipped or stopped beats. The heart's rhythm may be normal or abnormal.<unk> s can be felt in your chest, throat, or neck.
Palpitation
Chest pain  
Chest pain
Bradycardia
Tachycardia
Irregular pulse
Pump
Orthopnea