Sinusitis is a common inflammation of the paranasal sinuses, the cavities that produce the mucus necessary for the nasal passages to work effectively.
It can be acute or chronic, and it can be caused by bacteria, viruses, fungi, allergies, or even autoimmune reaction.
Although it’s uncomfortable and painful, sinusitis often goes away even without medical intervention. However, if symptoms lasts for more than 7 days (10 days max), or if there is a fever or a bad headache, you should go see your doctor.
