Angor with non-obstructive coronary arteries or ischemia with non-obstructive coronary arteries (ANOCA/INOCA) is a condition where a patient experiences symptoms and/or signs of myocardial ischemia, without significant coronary artery stenoses. This syndrome is often caused by a direct imbalance between supply and demand, leading to inadequate myocardial perfusion due to microvascular limitations or coronary arteries' spasms. Although previously considered benign, there is increasing evidence that ANOCA/INOCA is associated with a poor quality of life, significant burden on the healthcare system, and major adverse cardiac events. This article reviews the definition of ANOCA/INOCA, epidemiology, risk factors, management, and current knowledge gaps and clinical trials.