Breathing in wildfire smoke can cause a headache right away, according to the Centers for Disease Control and Prevention, and short-term exposure to particulate matter from wildfires has been linked to an increase in emergency room visits for headaches.Researchers are not entirely sure why wildfire smoke causes headaches, but one reason may be that it can alter the sensitivity of certain neurons, which in turn can increase the risk of headaches, said Dr. Raj Fadadu, a researcher at the University of California, San Francisco School of Medicine who has studied the health effects of wildfire smoke.
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