 Dr. Rachel Marquez is a physician at Kaiser Permanente and says sunlight can also be a trigger. If you do get a heat-induced headache or migraine, try to cool off inside or in the shade and grab a wet washcloth. You can put it on your neck, put it on your forehead to kind of help bring the heat and the body temperature down a little bit to kind of help break that headache. If your headache lasts longer than 24 hours, seek medical attention. Lynn Bowie, WTOP News.