Ask the doctors.  I recently felt a sudden, sharp pain in my upper back and could not imagine what caused it.  Do you have any idea?  I was worried it was a heart attack.
Thomas H
TH
Lee
Richard T
RT
Lee
D000784:Aortic Dissection / Q000150:complications* / Q000175:diagnosis; D017545:Aortic Aneurysm, Thoracic / Q000150:complications* / Q000175:diagnosis; D001416:Back Pain / Q000209:etiology*; D003937:Diagnosis, Differential; D006304:Health Status; D006801:Humans