There are a vast number of causes of<unk> s, including namely any condition that causes the heart to be rapidly, forcefully, or irregularly.  In general,<unk> s may be caused by primary abnormalities in the heart (tachycardia or forceful heart beating), reductions in oxygen carrying capacity (anemia), reductions in the volume of blood circulating (dehydration), sympathetic nervous system stiumlation (fever, exertion, panic attacks, drugs), excess hormone production (hyperthyroidism).
Pharmacological causes should also be taken into consideration.
Palpitation causes
Chest pain causes
Orthopnea causes
Mastalgia causes
Heart murmur causes
Hemoptysis causes
Dyspnea causes
Concussion causes