Your sinuses are hollow spaces behind your cheeks and forehead. Each sinus opens into your nose. Sinusitis is inflammation or an infection in one or more of your sinuses.
Sinusitis is usually caused by a:
The viral infection makes the tissue inside your nose swell. That's why your nose is stuffy when you get a cold. The swelling in your nose blocks the openings to your sinuses, which causes fluid to build up in the sinuses. Allergies Seasonal Allergy An allergy is when your body's immune system reacts to something harmless, such as food, plants, or medicine. Seasonal allergies are allergies that happen only during the time of year when a... read more also make the inside of your nose swell and can cause sinusitis.
Sometimes, bacteria get into the sinus fluid and cause:
Chronic sinusitis is more common if you have:
Go to a doctor right away if you have these symptoms and also a severe headache and are confused because the infection could have spread to your brain (meningitis).
Doctors treat sinusitis by helping your sinuses drain. Doctors will tell you to:
If you have a fever, severe pain, or sinusitis that lasts for more than 10 days, doctors usually prescribe antibiotics.
If you have chronic sinusitis (sinusitis that lasts more than 90 days), doctors may:
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