Signs & Symptoms Neurology & Neurosurgery

Brain Aneurysm
Signs and Symptoms

Brain aneurysms typically don't cause symptoms until they leak or rupture, causing bleeding into the brain and are discovered during tests for other conditions. Even when they cause no symptoms, these aneurysms should be treated to prevent future ruptures.

The hallmark symptom of a ruptured aneurysm is a sudden and extremely severe headache that may occur with nausea, vomiting, stiff neck, impaired consciousness, seizures or coma.

Symptoms of an unruptured aneurysm may include:

  • Cranial nerve palsy or erratic muscle movements
  • Dilated pupils
  • Double vision
  • Localized headache
  • Pain above and behind the eye

UCSF Health medical specialists have reviewed this information. It is for educational purposes only and is not intended to replace the advice of your doctor or other health care provider. We encourage you to discuss any questions or concerns you may have with your provider.