The type of chest pain known as angina is associated with inadequate blood flow through the coronary arteries due to fatty blockages called plaques. Many blockages can be seen on angiograms taken during a cardiac catheterization. However, those occurring in very small arteries may not appear on angiography, yet may cause angina (microvascular angina). Angina can also occur when plaque-free arteries spasm (vasospastic angina). Both types of angina are more common in women than in men.