Seizure
Breath-holding spell
Hyperventilation syndrome
Pregnancy (especially ectopic)
Hypoglycemia
Cardiac disease
Tet spell<unk> 
Brugada Syndrome
Dysrhythmias
Long QT syndrome
Anomalous coronary arteries
Toxicologic exposure (stimulants or depressant)
CO poisoning
Ethanol toxicity
Drugs of abuse
Tet spell<unk> 
Brugada Syndrome
Dysrhythmias
Long QT syndrome
Anomalous coronary arteries
CO poisoning
Ethanol toxicity
Drugs of abuse
Dilated cardiomyopathy<unk> 
Restrictive cardiomyopathy
Peripartum cardiomyopathy
Takotsubo cardiomyopathy
Arrhythmogenic right ventricular dysplasia
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
Pericarditis
Pneumothorax
Aortic stenosis
Arthritis
Asthma exacerbation
Biliary colic
Costochondritis
Esophageal spasm
Gastroesophageal reflux disease
Herpes zoster / Postherpetic Neuralgia<unk> 
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
Hypertrophic cardiomyopathy
Seizure
Restrictive cardiomyopathy
Breath-holding spell
Dilated cardiomyopathy
Hyperventilation syndrome
Mitral valve prolapse
Pregnancy 