Sinus Infection (Sinusitis): Causes, Symptoms & Treatment A sinus infection, also known as sinusitis, is a common condition that affects millions of people each year. It occurs when the sinuses, which are air-filled cavities in the skull, become inflamed due to an infection. Sinus infections can be acute, lasting a short time, or chronic, persisting for weeks or even months. In this blog, we’ll delve into the causes, symptoms, and treatment of...