New or severe headaches (especially in people over 50). A painful headache that seems to come out of nowhere means you are having a stroke. Pay special attention if your headache is accompanied by fever, stiff neck, rash, mental confusion, seizures, vision changes, speech problems, scalp tenderness, or pain when chewing. Arteritis (inflammation of the blood vessels), meningitis, brain tumors, aneurysms or bleeding can occur after a head injury.
Short-term loss of vision, speech, and movement control. Get immediate medical attention if any of the following occur to you.