Before rupturing, aneurysms usually produce no symptoms or warning signs. Weakness on one side of your body. Double vision that does not go away. When the aneurysm ruptures, in about half the cases, the person experiences an excruciating headache and falls unconscious almost immediately. In others, a headache develops but the person remains conscious.
Some people have no headache and become unconscious quickly without warning.
To diagnose a subarachnoid hemorrhage, you will probably have a brain scan. The doctor may do a lumbar puncture to see how much blood has mixed with the cerebrospinal fluid. To determine where the blood vessel broke, the doctor may do an angiogram. During this procedure, dye is injected into your bloodstream and x-rays are taken. The dyed blood vessels then appear on the x-ray film.