Pain in the forehead or between the eyes? Upper teeth ache? Face feeling full, nose stuffy and congested? You may have a common complaint that sends many people to a doctor's office: sinus trouble.
Sinuses: Air Spaces in Your Head
Sinuses are air spaces in your skull lined with mucous membranes. Most people have four sets of nasal sinuses:
Two frontal sinuses in the forehead above the eyes
Two maxillary sinuses, one inside each cheek bone (dark triangles seen in this CAT scan)
Ethmoid sinuses: a group of cavities behind the bridge of the nose
Sphenoid sinuses, behind the nose and underneath the brain
Sinuses are like fingerprints; everybody's are different. Some people have no frontal sinuses or just one.
What Is Sinusitis?
Tiny, hair-like structures called cilia (magnified here) help move mucus across sinus membranes and toward an exit. All of your sinus cavities connect to your nose to allow a free exchange of air and mucus. Infections or allergies make sinus tissues inflamed, red, and swollen. That's called sinusitis.
Just a Cold … at First
Sinusitis usually starts with inflammation triggered by a cold, allergy attack, or irritant. But it may not end there. Colds, allergies, and irritants make sinus tissues swell.
Stuffy, Puffy, and Sore
Sinusitis causes many symptoms. Most people have a stuffy nose and pain or pressure in several locations around the face or teeth. There's usually a nasal discharge that may be yellow, green, or clear. Other symptoms may include fatigue, decreased sense of smell and/or taste, cough, sore throat, bad breath, headache, pain on bending forward, and fever.
The blue areas in this color-enhanced MRI show thickened mucosal surfaces on both maxillary sinuses. Inflammation of the sinus cavity that lasts for more than three months is chronic sinusitis. Although bacteria often colonize obstructed sinuses, bacterial infections are not the only cause of chronic sinusitis. Anatomy, allergies, polyps, immune deficiencies, and dental diseases may also cause chronic sinus problems.
When sinuses remain inflamed, sinus membranes may thicken and swell. The swelling can be significant enough to cause grape-like masses called polyps (shown here). Polyps may protrude from the sinus into the nasal passage and partially or completely block the nasal airway.
Nasal Decongestants: Relief, at a Cost
These sprays open swollen nasal passages and allow your sinuses to drain. That can be helpful, especially during the worst days of a cold or during air travel. But you should use these drugs only for a few days. After that, there's a kick-back effect, making your nasal passages swell shut again. Decongestants are not indicated for chronic use. Oral decongestants may help, but also have side effects. Better solutions for acute sinus symptoms: nasal steroid sprays or saline sprays or washes. If symptoms persist, see your doctor. Chronic sinus symptoms may be caused by a deviated septum or another treatable condition.
Antibiotics Usually Not Needed
The common cold is a viral infection. Colds can lead to sinusitis symptoms, but these usually clear by themselves. Antibiotics do not treat viruses, so they won't help the sinus symptoms of a cold. Cold symptoms end in seven to 14 days. Usually, cold-related sinusitis goes away then, too.
Shown here is a magnified, color-enhanced image of a rhinovirus pathogen responsible for the common cold.
Treating Allergy-Related Sinusitis
What can help allergy-related sinus symptoms is irrigation with saline solution, either with a neti pot or squeeze bottle. Although there's no evidence they help with sinus infections, nasal steroid sprays may help some people suffering sinus symptoms from allergies. Antihistamines may help, too, especially for symptoms of sneezing and runny nose.
When to See the Doctor
Yellow or green mucus can mean a bacterial infection. Even then, acute bacterial sinusitis usually clears up in seven to 14 days -- without antibiotic treatment. But if you keep feeling worse and symptoms are persistent and severe, or if you get a fever, it's time to see a doctor.
Chronic Sinusitis Treatment Still a Puzzle
Chronic sinusitis is very difficult to treat. A first step is controlling predisposing factors such as eliminating environmental irritants. For symptom relief, doctors often prescribe nasal steroid sprays or antibiotics, but neither is proven to work in comprehensive studies. Surgery -- functional endoscopic sinus surgery or FESS -- offers at least moderate relief -- but this is not intended as first-line treatment for chronic sinusitis.
Sinusitis Complications: Worst-Case Scenarios
Only a layer of bone separates your sinuses from your brain. If a sinus infection passes through the bone, it can infect the lining of the brain -- meningitis -- or even the brain itself. Both problems are life threatening. A sinus infection can also spread into the orbit of the eye, causing an infection around the eye and possibly blindness. Less severe complications include asthma attacks and loss of smell or taste.
There's no sure way to avoid either acute or chronic sinusitis. But here are some things that can help:
Keep sinuses moist -- use saline sprays, nasal lubricant sprays, or nasal irrigation often.
Avoid very dry indoor environments.
Avoid exposure to irritants, such as cigarette smoke or strong chemical odors.
Sinusitis is an inflammation, or swelling, of the tissue lining the sinuses. Normally, sinuses are filled with air, but when sinuses become blocked and filled with fluid, germs (bacteria, viruses, and fungi) can grow and cause an infection.
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Structural differences that narrow the drainage ducts
Conditions that result in an increased risk of infection such as immune deficiencies or taking medications that suppress the immune system.
In children, common environmental factors that contribute to sinusitis include allergies, illness from other children at day care or school, pacifiers, bottle drinking while lying on one's back, and smoke in the environment.
In adults, the contributing factors are most frequently infections and smoking.
What Are the Signs and Symptoms of Acute Sinusitis?
Some of the primary symptoms of acute sinusitis include:
American College of Physicians, PIER: Physicians Information and Education Resource web site.
Jim Young, PhD, biostatistician, Basel Institute for Clinical Epidemiology, University Hospital Basel, Switzerland.
Joe, S.A. Otolaryngology -- Head & Neck Surgery, September 2008.
Jordan S. Josephson, MD, director, New York Nasal and Sinus Center and author, Sinus Relief Now, Perigee Trade, December 2006.
Harvey, R. Cochrane Database Systematic Reviews, Jul. 18, 2007.
Ian G. Williamson, MD, senior lecturer, University of Southampton, England.
Lim, M. American Journal of Rhinology, July/August 2008.
Lindbaek, M. Journal of the American Medical Association, Dec. 5, 2007.
Morten Lindbaek, MD, PhD, professor, University of Oslo, Norway.
National Institute of Allergy and Infectious Diseases web site.
Piccirillo, J.F. The New England Journal of Medicine, Aug. 26, 2004.
Schumann, S.A. and Hickner, J. Journal of Family Practice, July 2008.
Williamson, I.G. Journal of the American Medical Association, Dec. 5, 2007.
THIS TOOL DOES NOT PROVIDE MEDICAL ADVICE. It is intended for general informational purposes only and does not address individual circumstances. It is not a substitute for professional medical advice, diagnosis or treatment and should not be relied on to make decisions about your health. Never ignore professional medical advice in seeking treatment because of something you have read on the WebMD Site. If you think you may have a medical emergency, immediately call your doctor or dial 911.