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 viruses, bacteria, fungi, allergies, or even an autoimmune reaction.Although uncomfortable and painful, sinusitis often goes away without medical intervention. However, if symptoms last more than 7 to 10 days, or if there is a fever or a bad headache, you should see your doctor.

Symptoms

Symptoms vary, depending on the length and severity of the infection. If the patient has two or more of the following symptoms and thick, green or yellow nasal discharge, they may be diagnosed with acute sinusitis. facial pain and pressure, blocked nose, nasal discharge, reduced sense of smell, congestion ,cough

Causes

Sinusitis can stem from various factors, but it always results from fluid becoming trapped in the sinuses. This fuels the growth of germs. • Viruses: In adults, 90 percent cases of sinusitis result from a virus • Bacteria: In adults, 1 case in 10 is caused by bacteria • Pollutants: Chemicals or irritants in the air can trigger a buildup of mucus • Fungi: The sinuses either react to fungi in the air, as in allergic fungal sinusitis (AFS), or they are invaded by fungi, as in chronic indolent sinusitis.