The most common cause of aneurysms (abnormal dilation of blood vessels) is ____.

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The most common cause of aneurysms is atherosclerosis, which is the buildup of fatty deposits inside arteries. This can weaken the walls of blood vessels and cause them to bulge or widen, leading to an aneurysm. Genetic defects and external injury can also cause aneurysms, but they are less common than atherosclerosis. Advancing age is a risk factor for developing aneurysms, but it is not a direct cause.

The Most Common Cause of Aneurysms (Abnormal Dilation of Blood