Swelling and pressure in the face from clogged sinuses can cause a headache. The blockage and inflammation make the person unconsciously tighten the muscles around the forehead and the top of the head -- similar to what happens during a tension headache. The pain usually worsens in the morning because fluids have built up during the night due to the recumbent position of the head. Changes of temperature or rapid changes in head orientation can also exacerbate headaches.

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