Why does Head Ache occur when there blocakge in Nasal Cavity?!

Question:
Answers:
Sinus cavities behind nose and under eyes get infected w/ allergen and swell up therefore putting pressure on the brain and eyes at times

Other Answers:
Pressure in that area. A vaporizer usually helps. Or steam.

Answers:

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Why does Head Ache occur when there blocakge in Nasal Cavity?!

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