For me, anything that cases stimulation of the nerves of the face/head. Too much sugar, too much dairy, brewed decaf, overdoing on exercise, too long at the computer, too much sun, as well as overdoing food triggers. Barometric pressure changes can be an issue during winter. I can feel when the nerves are overstimulated (even my lips feel like they are vibrating) and I have to be very careful for a few days while they calm down. Sometimes I take Nasonex or Allegra if it also causes sinus issues and ear fullness. Good luck. Spinninggirl (Vertigotalesandtastes@blogspot.com)
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