What is the cause of a sinus infection?

Bacterial vs. Viral. Typically bacterial or viral in origin. Viruses tend to resolve on their own in a few days (think of the common cold) whereas bacterial infections persist longer than a week and/or there's a "double-worsening" where one starts to feel better, and then the symptoms relapse. Antibiotics like Azithromycin and Augmentin (amoxicillin and clavulanate) are used to treat bacterial sinus infections.
Cause of Sinus. Anything that irritates the nasal and sinus membranes for longer than a few days is what causes sinus infections. A common cold, smoke, acid reflux, all can lead to inflammation and the resultant swelling. Swelling leads to blockage of sinus passages.

Related Questions

What are the causes of a sinus infection and is it preventable?

Viral. The overwhelming majority of sinus infections are viral in nature, and are self-limited. They are not really preventable, as the viruses are everywhere. Read more...

What is the cause of sinus infection in elder people?

Bacteria. Bacteria is the main cause of a sinus infection. They can occur at any age. The only reason they may occur more frequently in the elderly is because their immune system is somehow compromised due to medications, illness, or other health problems. Read more...

What could cause my chronic sinus infection?

Not always infection. Chronic sinusitis is symptoms persisting for three or more months. Symptoms are congestion, drainage, facial discomfort, reduced smell. Causes are bacterial, allergic, nonallergic inflammation, structural, dental, medication side effects, environmental, and from a systemic disorder. There is not an easy answer. Suggest ENT evaluation. Read more...

What causes rid of a sinus infection?

Antibiotics. Normal treatment of a sinus infection is a 7 day course of antibiotics, decongestants and drinking plenty of fluids. Nasal inhalation of steam and salt water irrigations can help alot as well. Read more...

What commonly causes a sinus infection, and is it preventable?

Cause of sinus inf. For most people who get acute sinusitis it is caused by inflammation and thickening of the mucous membranes which block the very small openings of the sinuses and causes back of fluid, which is a great place for germs to grow. By far the most common causes are the ordinary cold and allergies. Regular sinus rinsing is probably the best preventive treatment. Read more...

What causes a sinus infection?

Lots of things. Anything that clogs the nose can block the sinuses. Common causes of nasal swelling include upper respiratory tract infections (colds) and allergies. Once the sinuses cannot drain, bacteria can accumulate in the sinuses and increase in large enough numbers to cause the symptoms of infection. The bacteria can come from various sources, including the nasopharyx and the adenoids that reside there. Read more...