Sinus Infection (Sinusitis): Causes, Symptoms & Treatment

Sinusitis is an inflammation of the tissues in your sinuses. It’s usually caused by viruses, but can also be caused by bacteria or allergies.

Sinus Infection (Sinusitis or Rhinosinusitis) > Fact Sheets > Yale Medicine

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Sinus Infection (Sinusitis) - Symptoms and Causes

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Sinus Infection (Sinusitis) - Symptoms and Causes