Sinusitis, also known as a sinus infection, is a common condition that occurs when the sinuses become inflamed or infected. The sinuses are air-filled cavities located in the skull, and they are lined with mucous membranes that produce mucus to help trap dirt, dust, and other particles.

Symptoms of sinusitis may include facial pain or pressure, nasal congestion, headache, cough, and a thick yellow or green nasal discharge. Other symptoms may include fever, fatigue, and a reduced sense of smell or taste.

Sinusitis can be caused by a variety of factors, including bacterial, viral, or fungal infections, allergies, or structural abnormalities of the nose and sinuses. Treatment for sinusitis typically involves medications to relieve symptoms and treat the underlying cause of the infection.

Over-the-counter pain relievers, such as acetaminophen or ibuprofen, may be recommended to relieve facial pain and headaches. Decongestants, such as pseudoephedrine or phenylephrine, may help to relieve nasal congestion. In some cases, nasal corticosteroid sprays may be prescribed to reduce inflammation and improve breathing.

Antibiotics may be prescribed for bacterial sinus infections, but they are not effective for viral or fungal infections. In some cases, surgery may be necessary to correct structural abnormalities or remove nasal polyps.

Prevention of sinusitis can be achieved through good hygiene practices, such as washing hands regularly and avoiding close contact with people who are sick. It is also important to manage allergies and avoid exposure to irritants, such as smoke and pollutants, that can irritate the nasal passages and sinuses.