Write down any of the common yet easily overlooked warning signs of a big headache. Among them: yawning a lot, trouble concentrating, a stiff neck.  In a 2003 study, American and British neurologists asked 97 frequent migraine sufferers to keep track of these “premonitory symptoms.” At least half of the time, most of them got a migraine within 72 hours.  You can use your signals to head off a big headache. First, keep track of your potential signals for a few weeks; note which ones lead to pain. The American Council for Headache Education offers a free printable headache diary on their website. Then, when you get a migraine signal, be very careful to avoid whatever triggers your headaches. It could be stress, food (check out these common food triggers), or even bright light. Taking a prescription migraine med at the first sign of symptoms can halt an attack or cut the pain level. An OTC pain reliever can help too.  [sidebar]Headache Signals Top warning signs that you could develop a migraine within 3 days: 

Difficulty expressing yourself in writing or in conversationFeeling emotionally rawExcessive yawningBlurred visionUltrasensitivity to bright light or loud noiseDizzinessTirednessTrouble concentratingStiff neckIrritabilityThirst and/or food cravings

  More from Prevention: Answers To Your Top Migraine Questions