Ask Heather - air pressure and migraines

KNOXVILLE, Tenn. (WVLT) -- This week's Ask Heather question comes from Brandy, who wanted to know why she gets migraines when the weather changes.

Do you have a family member that swears their head, hip, or maybe knee lets them know when the weather is going to change? For Brandy Blanton, it's migraines, which I understand because it's my knee.

Air pressure is basically the weight of the air on the surface, or in this case, your body.

Pressure fluctuates every day, usually maxing in the early morning hours or the coolest part of the day. The reverse, it drops to the warmest part of the day.

Major changes in pressure come in with fronts, as low pressure is the center driving force for fronts.

High pressure is associated with clear calm conditions. In this case, there's more "weight" on your body.

So, when the pressure drops there's less weight on your body. While there's no medical agreement on this impact, your joints could swell and your head could feel the differences.

This is also why you may swell a little when you fly, there's less pressure at higher altitudes.

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