Brain aneurysm - Symptoms. Symptoms of a brain aneurysm. A brain aneurysm rarely causes any symptoms unless it bursts (ruptures). Unruptured brain aneurysms occasionally cause symptoms if they're particularly large or press against tissues or nerves inside the brain. Symptoms of an unruptured brain aneurysm can include: 1  visual disturbances – such as loss of vision or double vision. 2  pain above or around your eye.  numbness or weakness on one side of your face.