Sometimes the aorta—the largest blood vessel in our bodies—can tear, allowing blood to flow between layers of the aortic wall. This dissection can block blood from flowing to other parts of the body, ...
An aortic dissection happens when tears appear in the inner lining of the aorta, which is the main artery leaving the heart. Blood surges into the tears, causing the aorta lining to split, or dissect.