Cardiac
ST-segment elevation myocardial infarction (STEMI)
Post-MI (ventricular aneurysm pattern)
Previous MI with recurrent ischemia in same area
Wellens' syndrome
Coronary artery vasospasm (eg, Prinzmetal's angina)
Coronary artery dissection<unk> 
Myocarditis
Aortic dissection in to coronary
Left ventricular aneurysm
Left ventricular pseudoaneurysm
Early repolarization
Left bundle branch block
Left ventricular hypertrophy (LVH)
Myocardial tumor
Myocardial trauma
RV pacing (appears as Left bundle branch block)
Brugada syndrome
Takotsubo cardiomyopathy
AVR ST elevation
Other thoracic
Pneumomediastinum
Pneumothorax
Pulmonary embolism
Metabolic
Drugs of abuse (eg, cocaine, crack, meth)
Cocaine chest pain
Hyperkalemia (only leads V1 and V2)
Hypothermia ("Osborn J waves")
Medications
Tricyclic (TCA) toxicity
Digoxin
ST-segment elevation myocardial infarction (STEMI)
Post-MI (ventricular aneurysm pattern)
Previous MI with recurrent ischemia in same area
Wellens' syndrome
Coronary artery vasospasm (eg, Prinzmetal's angina)
Coronary artery dissection<unk> 
Myocarditis
Aortic dissection in to coronary
Left ventricular aneurysm
Left ventricular pseudoaneurysm
Early repolarization
Left bundle branch block
Left ventricular hypertrophy (LVH)
Myocardial tumor
Myocardial trauma
RV pacing (appears as Left bundle branch block)
Brugada syndrome
Takotsubo cardiomyopathy
AVR ST elevation
Pneumomediastinum
Pneumothorax
Pulmonary embolism
Drugs of abuse (eg, cocaine, crack, meth)
Cocaine chest pain
Hyperkalemia (only leads V1 and V2)
Hypothermia ("Osborn J waves")
Cocaine chest pain
Tricyclic (TCA) toxicity
Digoxin
Acute coronary syndromes (ACS)
STEMI
Non-STEMI
Unstable angina
Aortic dissection
Cardiac tamponade
Coronary artery dissection
Esophageal perforation (Boerhhaave's syndrome)
Pulmonary embolism
Tension pneumothorax
STEMI
Non-STEMI
Unstable angina
Cholecystitis
Cocaine-associated chest pain
Mediastinitis
Myocardial rupture
Myocarditis
Pancreatitis<unk> 
Pneumothorax
Aortic stenosis
Arthritis
Asthma exacerbation
Biliary colic
Costochondritis
Esophageal spasm
Gastroesophageal reflux disease
Herpes zoster / Postherpetic Neuralgia
Hypertrophic cardiomyopathy
Hyperventilation
Mitral valve prolapse
Panic attack
Peptic ulcer disease
Pleuritis
Pneumomediastinum
Pneumonia
Rib fracture
Stable angina
Thoracic outlet syndrome
Valvular heart disease
Muscle sprain
Psychologic / Somatic Chest Pain
Spinal Root Compression
Tumor
Pericarditis
Cardiac
Constrictive pericarditis
ST-segment elevation myocardial infarction 
Myocarditis 
Post-MI 
Myocarditis
Previous MI with recurrent ischemia in same area