Why does a Sinus Headache hurt?

Sinus headaches hurt because of a pressure build-up inside the sinus cavities.

When a sinus cavity becomes infected with a bacterial or viral infection, the body sends white blood cells to the location in the sinuses to fight off the infection. White blood cells cause swelling and inflammation in the sinuses. The body also starts producing lots of mucus to help flush the bacteria and viruses out.

The inflammation and excess mucus production causes congestion, which leads to pressure inside the sinuses. This pressure causes pain and tenderness around and behind the eyes, in the forehead, toothache like pain, a sore nose and headaches.

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