Inclusion criteria  Age >18 years Patients with a presentation of typical or atypical chest pain (ICD-10 Code R07.89, R07. 9) Patients with a negative ischemic workup: (including Coronary Artery Calcium Scoring/CTA, MPI, Nuclear Stress test, LHC/angiography showing anything greater than "non-obstructive CAD")  Exclusion criteria  Patients with any evidence of positive ischemic workup as the cause of typical/atypical chest pain (as seen on Coronary Artery Calcium Scoring/CTA, MPI, Nuclear Stress test, LHC/angiography) Previously documented history of Prinzmetal angina or coronary vasospasm History of prior myocardial infarction History of any prior CAD with severity greater than "non-obstructive CAD" in all 3 coronary arteries History of LVEF<40% Previously documented history of pericarditis Previously documented history of costochondritis