Symptoms

According to the Brain Aneurysm Foundation one in fifty people in the U.S. have an unruptured brain aneurysm. The annual rate of rupture is 8 to 10 out of each 100,000, 40% of which are fatal. Four out of seven patients who recover will have disabilities.Brain aneurysms are most prevalent in people ages 35 – 60, but can occur in children as well. The median age when aneurysmal hemorrhagic stroke occurs is 50 years old and there are typically no warning signs. Most aneurysms develop after the age of 40. Women, more than men, suffer from brain aneurysms at a ratio of 3:2.
Accurate early diagnosis is critical, as the initial hemorrhage may be fatal, or may result in devastating neurologic outcomes.Despite widespread neuroimaging availability, misdiagnosis or delays in diagnosis occurs in up to 25% of patients with subarachnoid hemorrhage (SAH) when initially presenting for medical treatment. Failure to do a scan results in 73% of these misdiagnoses. This makes SAH a low-frequency, high-risk disease.There are almost 500,000 deaths worldwide each year caused by brain aneurysms and half the victims are younger than 50.

Unruptured brain aneurysms are typically completely asymptomatic. These aneurysms are typically small in size, usually less than one half inch in diameter. However, large unruptured aneurysms can occasionally press on the brain or the nerves stemming out of the brain and may result in various neurological symptoms. Any individual experiencing some or all of the following symptoms, regardless of age, should undergo immediate and careful evaluation by a physician.

Localized Headache
Dilated pupils
Blurred or double vision
Pain above and behind eye
Weakness and numbness
Difficulty speaking

Ruptured brain aneurysms usually result in a subarachnoid hemorrhage (SAH), which is defined as bleeding into the subarachnoid space. When blood escapes into the space around the brain, it can cause sudden symptoms.

Seek Medical Attention Immediately If You Are Experiencing Some Or All Of These Symptoms:

Sudden severe headache, the worst headache of your life
Loss of consciousness
Nausea/Vomiting
Stiff Neck
Sudden blurred or double vision
Sudden pain above/behind the eye or difficulty seeing
Sudden change in mental status/awareness
Sudden trouble walking or dizziness
Sudden weakness and numbness
Sensitivity to light (photophobia)
Seizure
Drooping eyelid

Risk factors that doctors and researchers believe contribute to the formation of brain aneurysms:

Smoking
High blood pressure or hypertension
Congenital resulting from inborn abnormality in artery wall
Family history of brain aneurysms
Age over 40
Gender, women compared with men have an increased incidence of aneurysms at a ratio of 3:2
Other disorders: Ehlers-Danlos Syndrome, Polycystic Kidney Disease, Marfan Syndrome, and Fibromuscular Dysplasia(FMD)
Presence of an arteriovenous malformation (AVM)
Drug use, particularly cocaine
Infection
Tumors
Traumatic head injury

Risk factors that doctors and researchers believe contribute to the rupture of brain aneurysms:

Smoking
High blood pressure or hypertension

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