Upstate neurologist Rosamma Joseph, MD, shares several "red flags" regarding headaches that indicate a person should promptly seek medical care. She also discusses the diagnosis and treatment of migraines -- which affect about 15 percent of the population worldwide. The red flags include: headaches that come on suddenly; cause extreme pain; are associated with confusion or disturbed vision, balance or speech; are associated with fever, seizures or unconsciousness; or are accompanied by a stiff neck or rash. Joseph notes that the websites of the National Headache Foundation and the American Migraine Foundation offer helpful information.