1. Causes of a ruptured cerebral aneurysm
A. Factors that weaken blood vessel walls
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Long-term high blood pressure (hypertension), which weakens vessel walls.
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Atherosclerosis, which reduces elasticity of arteries.
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Head trauma (rare, but may rupture an existing aneurysm).
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Vascular infections (mycotic aneurysm).
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Smoking (a major risk factor).
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Heavy alcohol use and stimulant drugs (especially cocaine, amphetamines).
B. Congenital or medical conditions associated with aneurysms
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Connective tissue disorders (Marfan syndrome, Ehlers–Danlos).
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Polycystic kidney disease.
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Arteriovenous malformations (AVMs).
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Family history of brain aneurysms.
C. Situations that can trigger rupture
Rupture can occur when blood pressure suddenly increases:
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Straining during bowel movements.
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Intense physical exertion.
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Stress or emotional surges.
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Sexual activity.
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Sudden spikes in blood pressure.
However, many aneurysms rupture during rest or sleep without warning.
2. Symptoms of a ruptured aneurysm
A rupture causes a subarachnoid hemorrhage (SAH), a neurological emergency.
Most prominent symptom
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A sudden, extremely severe headache
– often described as “a thunderclap” or “the worst headache of my life,” occurring within seconds.
Other common symptoms
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Severe nausea and vomiting
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Neck stiffness
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Sensitivity to light
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Blurred or double vision
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Altered consciousness: confusion, drowsiness, or deep coma
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Seizures
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Weakness or paralysis on one side of the body
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Unilateral dilated pupil (suggesting nerve compression)
Severe, life-threatening signs
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Immediate loss of consciousness
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Brief breathing arrest
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Bilateral fixed dilated pupils
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Deep coma (GCS < 7)
3. Warning symptoms before rupture (if present)
About 10–20% of patients may have warning signs hours to days before rupture:
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Unusual or persistent headache
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Blurred vision
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Pain around the eye
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Drooping eyelid
But many cases have no warning signs at all.