Angiography is used to diagnose and treat various blood vessel issues. Common reasons include: Suspected blocked arteries: If you experience chest pain (angina), leg pain, or numbness, an angiogram can pinpoint blockages in your arteries. Aneurysm concerns: This procedure helps identify bulges (aneurysms) in your blood vessels. Guiding treatment: During procedures like angioplasty or stent placement, angiography provides real-time visualization of blood flow.