title: Last week, I had chest pain and called 911.  The hospital did a lot of tests, and said it wasn't a heart attack.  Could this be so? What should I do if it happens again?
mesh_terms: D000553:Ambulatory Care; D002637:Chest Pain / Q000175:diagnosis / Q000209:etiology*; D003937:Diagnosis, Differential; D015155:Esophageal Spasm, Diffuse / Q000150:complications / Q000175:diagnosis*; D005764:Gastroesophageal Reflux / Q000150:complications / Q000175:diagnosis*; D006801:Humans; D017202:Myocardial Ischemia / Q000150:complications / Q000175:diagnosis*; D016584:Panic Disorder / Q000150:complications / Q000175:diagnosis*; D014481:United States