Weather causes changes in air pressure, similar to say, going up a tall mountain or diving under water. Your sinus has a lot of small veins in it pretty close to the surface which means that if the outside pressure drops, the blood pressure of your own veins are effectively ‘pushing out’ on your sinus, and possibly pushing against very sensitive nerve endings, which can cause discomfort. Changes in humidity can also drastically affect your mucus production and consistency, which can exacerbate the problem.
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