An aneurysm — a dangerous bulging of a weakened blood vessel — can develop silently, but it also produces recognizable warning signs that should never be dismissed. When an aneurysm ruptures, it can trigger severe internal bleeding and prove fatal. Knowing which symptoms to watch for, and acting quickly, can make a critical difference in outcomes.
In brief
- —A ruptured aneurysm can cause severe bleeding and death
- —Brain, aortic and abdominal aneurysms each produce distinct symptoms
- —Sudden, severe symptoms require immediate emergency care
The "worst headache of your life" and other brain aneurysm red flags
The most widely cited early warning sign of a brain aneurysm is a sudden, extremely intense headache — often described as the worst headache of one’s life. It comes on rapidly and with a severity clearly distinct from any previous headache. This symptom alone warrants immediate medical evaluation.
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