Your sinuses are air-filled pockets that are located behind your face. When fluid builds up in your sinuses, germs like viruses and bacteria can multiply and lead to a sinus infection. COVID-19 is a ...
The size and shape of the frontal sinus can vary from person to person. These spaces fill up with mucus, which then drain into the nose. The draining process can be hindered by blockages. If mucus ...
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