What may be the causes of heart pain except acute coronary syndrome & angina pectoris?

Several things: It is important to rule out catastrophic causes like acs, dissection of aorta . Constochondritis and muscular problems . Pneumonia and pul conditions. Gi conditions like gerd esophageal spasms could also cause chestpain. Nature, duration, location , associated symptoms and patient risk factors are helpful in initial assessment.

Some: Those are the common ones. Pericarditis pericardial effusion myocarditis other cause of chest pain- lung, esophagus etc. Can be confusing.