Sinuses, the horror. The torture. Try being cute or fly with a bad sinus infection. I dare you. Sinusitis is an inflammation, or swelling, of the tissue lining the sinuses. Normally, sinuses are filled with air, but when sinuses become blocked and filled with fluid, germs (bacteria, viruses, and fungi) can grow and cause an infection. … [Read more...] about POU Weekly Health Thread: Sinuses…….UGH