How do you know if you have a sinus infection (sinusitis) or. A sinus infection, a. k. a. sinusitis, happens when fluid builds up in your sinuses, the air-filled pockets in your face, per the centers for disease control and prevention (cdc). that allows germs. Coronavirus and a sinus infection can have similar symptoms, such as nasal congestion, fever, and cough. our cooper experts have put together a guide to help you differentiate the two. if you have flu-like symptoms and think you may have been exposed to covid-19, please review our instructions and information on our testing sites. A sinus infection, or sinusitis, occurs when the air-filled pockets in the face, called sinuses, fill up with fluid, inflaming the sinus lining and preventing them from draining. the trapped mucus can allow bacteria to grow, which leads to an infection, cooling said. Sinusitis is an inflammation of the sinuses. most often it’s the result of an infection and can be caused by viruses, bacteria and, less ...