After you start experiencing symptoms, a doctor may be able to diagnose an aneurysm. It is essential to make an appointment with your doctor if you experience a sudden and severe headache or any other symptoms related to a brain aneurysm. In the case of an emergency room visit, the patient will immediately undergo diagnostic testing to determine if he or she has an aneurysm and if it has ruptured. These tests will be able to identify any bleeding in the space between the brain and its lining.

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