What causes sinusitis?

Various. There are many possible causes of sinusitis, including but not limited to infection, allergies, inflammatory disease, problems with the anatomy (shape) of the sinuses, even masses.
Viral and bacterial. Sinusitis is an inflammation of the paranasal sinuses in the face and frontal bones. It always starts with a viral rhinitis (cold) and in about 2% of cases becomes secondarily infected with bacteria. Thus viruses and bacteria and rarely fungi can spread from the nose and enter through very small openings in the lateral wall of the nose into the sinuses.
Often a virus. When the sinuses become congested, it can cause pressure and pain. Infections of the sinuses can be caused by viruses or bacteria.

Related Questions

What causes Sinusitis infection with a bad sore throat and what is the best treatment for it?

Sinusitis. Is caused by inflammation and infection of the nasal sinuses. Pain can be referred to the throat. Here is some general information on treatments https://patient.info/health/acute-sinusitis Most of the time decongestants and painkillers will help while your body sorts it out, but in a few circumstances antibiotics are considered. See you doctor for specific advice for your situation. Good luc. Read more...
Xylitol. Xylitol is a natural sugar and breaks up biofilm in the body. That's where germs mulitply. It is found in a nasal spray called xlear (pronounced "clear") and in chewing gum called spry. Pleasant tasting too! Please see doctor first. Read more...

What causes recurring sinusitis?

Anatomy or swelling. Simply put recurrent sinusitis can occur from 1) an anatomic abnormality that blocks the sinus from draining (like a deviated septum) 2) the lining to the sinuses may become inflamed and swell and close the sinus opening ( this is usually related to allergy). Medical therapy is the first line treatment but many times, anatomic issues need to be addressed with surgery. Read more...
Virus and anatomy. For true cases of recurrent bacterial sinusitis there usually are structural problems narrowing the sinus drainage routes.These openings are lined with mucous membrane.If these are too small and allergy or virus makes membrane swollen then narrow opening becomes obstructed trapping mucous which gets infected.Aggressive symptoms mgmt to keep swelling down and openings open may prevent infection. Read more...

What bacteria cause sinusitis?

Many different ones. Acute sinusitis is usually caused by some bacteria and chronic sinusitis is often cause by different ones. Oftentimes the infection may have more than one bacteria. The exact bacteria isn't generally important in acute sinusitis, as they usually respond well to typical antibiotics. If you have chronic sinusitis your ENT may recommend a culture of your nose to further investigate things. Read more...
Top 3... The top 3 bacteria causing acute sinusits in a typical patient are: 1. Streptococcus pneumoniae 2. Haemophilus influenzae 3. Moraxella catarrhalis most infections are proceeded by a viral sinusitis and then it will progress to a bacterial infection. Read more...

What are the causes of sinusitis?

Sinusitis. The common causes are bacteria and fungus. Patients with severe allergic rhinitis, severe septal deviation, nasal polyps, immunodeficiency, cystic fibrosis are prone to recurrent sinusitis. Read more...

What is the cause of sinusitis in general?

Drainage. Sinus health is all about drainage - if they can drain, they'll be fine. When swelling associated with allergies or either a bacterial or viral infection advances enough to interfere with sinus drainage, they can get infected, and pressure can build up into a sinus headache. Once the swelling goes down to the point the sinuses can drain again, they'll heal. Read more...
Virus. 98% of upper respiratory infections are due to viruses, for example the rhino virus. The swelling in the lateral wall of the nose then may lead to obstruction of narrow passages that lead into the sinuses in the face and between the eyes. This in general is the pathogenesis of sinusitis. Always starts in the nose and secondarily into the sinuses. Only 2% are complicated by bacteria. Read more...

Sinusitis: how do I know what allergies are causing my sinusitis?

Allergy and sinus. See your doctor. You probably need to see an allergist to test you for allergies to find out what you are allergic to, if you do have allergies. Read more...
Get checked. While allergies are frequently associated with sinus issues, I have found pathogens (infections) and toxins more frequently associated with sinus issues. Testing can identify which allergens, pathogens, or toxins are causing your sinus issues. When there is a significant sinus issue or asthma, I have been finding mold toxins present, and they can be detected with special urine testing. Read more...