A sinus infection, also known as sinusitis, is a common condition that affects the sinuses, which are air-filled cavities in the skull. Sinusitis can be caused by a variety of factors, including allergies, colds, and the flu. Symptoms of sinusitis can include facial pain and pressure, headache, nasal congestion, and discharge. In some cases, sinusitis can also lead to fever, fatigue, and difficulty concentrating.
If you think you may have a sinus infection, it is important to see a doctor to get a diagnosis. Your doctor will perform a physical examination and ask you about your symptoms. They may also order imaging tests, such as a CT scan or MRI, to confirm the diagnosis.