In a large percentage of patients, there is a finding of systemic<unk>  abnormalities, causing reduced blood flow in the<unk> ure of the cardiac muscles. When the blood vessels constrict and fail to dilate there is decreased oxygen levels to the cardiac muscles resulting in hypoxia which lead to chest pain. While numerous physiological mechanisms have been proposed, none have been proven.
Microvascular angina
Variant angina
Unstable angina
Renal angina
Coronary artery ectasia
Vasitis nodosa
Coronary artery aneurysm
Palisade 