Pleuritic chest pain
Radiates to chest, back, trapezius ridge (inferior portion of the scapula)
trapezius ridge muscles innervated by phrenic n. which also traverses pericardium.
Diminishes with sitting up/leaning forward
Shortness of breath
Especially if concommitant pleural effusion
Hypotension/extremis if cardiac tamponade
Fever, chills, myalgias (systemic signs with viral infection)
Friction rub
Radiates to chest, back, trapezius ridge (inferior portion of the scapula)
trapezius ridge muscles innervated by phrenic n. which also traverses pericardium.
Diminishes with sitting up/leaning forward
trapezius ridge muscles innervated by phrenic n. which also traverses pericardium.
Especially if concommitant pleural effusion
Pericarditis
Cardiac
Constrictive pericarditis
ST-segment elevation myocardial infarction 
Myocarditis 
Post-MI 
Myocarditis
Previous MI with recurrent ischemia in same area