Final answer:
An aneurysm is a bulge or ballooning in a blood vessel caused by a weak spot in the vessel wall. Aneurysms in the brain put you at risk for a potentially life-threatening condition called a subarachnoid hemorrhage.
Step-by-step explanation:
An aneurysm is a bulge or ballooning in a blood vessel caused by a weak spot in the vessel wall. When an aneurysm occurs in the brain, it is called a cerebral aneurysm. Aneurysms in the brain put you at risk for a potentially life-threatening condition called a subarachnoid hemorrhage. If an aneurysm ruptures, it causes bleeding in the space around the brain, leading to a sudden and severe headache, nausea, vomiting, blurred vision, and potentially loss of consciousness. Immediate medical attention is needed to prevent further damage.