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13 sneaky causes of sinus trouble

New research shows antibiotics don't make a difference when treating sinus infections. CBS News medical contributor Dr. Holly Phillips speaks to the "CBS This Morning" co-hosts about the study, and why antibiotics are ineffective.

Sinus infection relief

Antibiotics not the answer for sinus infection: study ( Sinus infections, the cause of untold misery, strike about 37 million people in the U.S. each year.

On the surface of things, the cause of sinus trouble is clear. Teeny holes that connect your nasal passages to your sinuses (basically a collection of hollow, moist cavities that lurk beneath your nose, eyes, and cheeks) get blocked. Then gunk builds up in your sinuses, germs may grow, and you feel, well, hideous.

But the cause of the blockage is sometimes trickier to figure out. From, here are 13 things that can cause an acute sinus infection (the most common type) and, in some cases, lead to a chronic sinus infection.

13 sneaky causes of sinus trouble

Germ-filled droplets can fly through the air, too, so if someone within six feet of you is coughing or sneezing, turn your head away for about 10 seconds while the air clears, Dr. Fryhofer advises, and (if you're in public, like in a cafe or on a bus or train) change seats as soon as you can. And do your part to prevent the spread of germs: If you do get sick, sneeze into your sleeve, toss tissues immediately, and - if possible - stay home until you're better. MORE FROM HEALTH.COM: 5 Myths about the Common Cold istockphoto


sneeze, elbow, woman, istockphoto, germs, 4x3Most sinus infections start with a cold. Colds are caused by a virus, which can make nasal tissue swell, blocking the holes that normally drain sinuses.

If your sinus infection is caused by a virus, antibiotics won't help since these drugs kill only bacteria. Your symptoms will probably get better after about a week or so. A decongestant can help, but don't use it for more than four or five days to avoid becoming dependent.

The best defenses against these sinus infections are the same things that protect against colds and the flu. In other words, get a flu shot, wash your hands, and don't chill with the visibly ill.

13 sneaky causes of sinus trouble

Allergy sufferers could have it especially bad this autumn. Experts say a rainy summer has led to unusually high levels of ragweed pollen and mold in the air - especially in some parts of the U.S. Keep clicking to see the 12 cities that top the Asthma and Allergy Foundation's list of worst cities for fall allergies. The ranking takes into account pollen scores, medication use, and access to allergy specialists to create the annual rankings... istockphoto


Because inflammation can block the nasal passages and prevent draining, allergies are often associated with sinus infections. In fact, studies have shown that people with sinus infections who have allergies tend to have more extensive sinusitis, says Dr. Sonia Bains, assistant professor in the Division of Pulmonary, Critical Care, Allergy, and Sleep Medicine at the Medical University of South Carolina.

If you're prone to allergies or hay fever, avoid things that trigger allergic reactions, such as dust mites, pet dander, mold, and cockroaches. Prescription or over-the-counter antihistamines and prescription nasal sprays can reduce chronic inflammation in the sinuses and nasal lining.

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13 sneaky causes of sinus trouble

A bacteria cloud iStockphoto


bacteria, microbes, genericIf a cold does not resolve in 10 to 15 days, bacteria may have joined the party.

Bacterial infections rarely jump-start sinus infections, but they are almost always the cause of complicating, secondary infections, says Dr. William J. Hueston, professor and chair of the Department of Family Medicine at the Medical University of South Carolina, in Charleston. In these cases, it's most likely Streptococcus pneumoniae or Haemophilus influenzae.

These bacteria lurk in healthy people; they're waiting for the right circumstances to grow. Take a decongestant during a cold to avoid those circumstances. If you do develop bacterial sinusitis, you can treat it with antibiotics.

13 sneaky causes of sinus trouble

generic nose smell face scent allergy allergies sinus cold flu CBS/iStockphoto


Nasal polyps are small, benign growths that develop from nose or sinus tissues and can cause the sinus cavities to become blocked, preventing mucus from draining and leading to sinus infection. These little gems can also restrict airway passages, which can in turn trigger headaches.

Chronic allergies can cause long-term swollen and scarred areas of the nasal passages and polyps, according to Dr. Hueston. People with nasal polyps often have a decreased sense of smell.

Polyps are treated with nasal steroid sprays or a short course of oral steroids, and if steroid treatments don't work, surgery may be necessary.

More from 10 Sinus Infection Symptoms

13 sneaky causes of sinus trouble

polluted, pollution, generic, dirty, sky, 4x3 istockphoto

Irritating pollutants

polluted, pollution, generic, dirty, sky, 4x3Allergens and pollutants in the air - like dust, outdoor air pollution, and strong odors like perfume - may contribute to coughing, irritate your nose, and cause inflammation that can increase your risk of sinusitis, according to Dr. Bains.

Avoid these irritants as much as possible to reduce the occurrence of sinus infections, particularly if you suffer from allergies or asthma. An air purifier may also reduce pollutants in the air. (Read our buyer's guide to air purifiers.)

13 sneaky causes of sinus trouble

A workout that requires coordinating arm and leg movements, such as swimming or step aerobics, feels easier than one that uses only one major muscle group, suggests research from Southwest Texas State University. That makes it more likely you'll do it again tomorrow - keeping the fat-burning going.More from The 7 best fat blasters istockphoto

Swimming and diving

If you're prone to sinus infections or congestion, avoid spending long periods in chlorinated pools, as chlorine can irritate your nasal lining and sinuses.

Diving into water can be a problem too. The pressure during a dive can push water into your sinuses, and irritate and inflame the tissue.

13 sneaky causes of sinus trouble

What to try: Traveling over the holidays? It could aggravate your sinuses. If you're congested or suffer from frequent sinus infections, but can't miss your flight, use decongestant nasal drops or a spray before takeoff to keep your sinuses clearMore from 10 hangover remedies: What works? istockphoto


Travel a lot for work or pleasure? It could aggravate your sinuses.

When the air pressure is reduced in-flight, it can cause pressure to build up in your head, which in turn can block your sinuses and air passages and aggravate cold symptoms. This is particularly problematic during takeoff and landing.

If you're congested or suffer from frequent sinus infections but can't miss your flight, use a decongestant nasal drop or inhaler before takeoff to keep your sinuses clear.

13 sneaky causes of sinus trouble

"Your nose is like a car windshield - pollen sticks to it," says Dr. Neil Kao, an allergist at the Allergic Disease and Asthma Center, in Greenville, S.C. Try a saline sinus rinse, found at any drugstore. If that doesn't do it, buy the nonprescription herbal nasal spray NasalCrom (cromolyn sodium), which helps prevent allergic reactions in your nose.More from 10 worst plants for your allergies istockphoto


"Fungi are very unusual causes of sinus infections," says Dr. Hueston. While fungal sinus infections can occur in healthy individuals, they are most common in people with weakened immune systems.

When your immune system is vulnerable, fungi can grow, especially in damp and dark environments - aka your sinuses. The most common fungus associated with sinusitis is Aspergillus.

In some people, chronic sinusitis can be caused by an allergic reaction to a fungus.

Treatments may include surgery to remove the fungi, antifungal therapy, or scraping the infected sinus. See your doctor if you have fever, headache, and vision problems for more than 10 days.

13 sneaky causes of sinus trouble

If nasal washes and antihistamines don't work for you, up the ante with a prescription steroid spray like Flonase, but you can skip decongestants; Dr. Kao says they don't work for allergies and may worsen your congestion after several days of use.More from 10 worst plants for your allergies istockphoto

Overuse of nasal products

While it's true that nasal decongestant sprays relieve congestion - they constrict the blood vessels in the nose - you should avoid prolonged use of over-the-counter nasal sprays, as they can make your symptoms worse if not used as directed.

If you use sprays for an extended period of time, you can become less sensitive to their effects so that your nose becomes swollen again, a condition known as rebound nasal congestion, says Dr. Bains.

As a result, prolonged use of OTC nasal sprays can lead to dependency, adds Dr. Hueston, who recommends that people who use sprays to treat cold symptoms stop after four or five days.

More from 10 Products to Help Your Sinuses.

13 sneaky causes of sinus trouble

More major cities in the United States are have banned indoor smoking than ever before, according to a new report from the Centers for Disease Control and Prevention. The agency says as of Oct. 2012, 30 of the largest cities in the U.S. are covered by the bans, a dramatic improvement from the year 2000 when San Jose, Calif. was the only large city with comprehensive legislation enacted. For the report, CDC researchers looked at the 50 largest U.S. cities by population, to see which of them had comprehensive indoor smoking bans on the books. A comprehensive law means it bans smoking in all indoor areas including workplaces, restaurants and bars. "Communities have made tremendous progress eliminating smoking from worksites and public places in 60 percent of big cities in the United States. Smoke-free laws save lives and don't hurt business," said CDC Director Thomas R. Frieden, M.D., M.P.H. "If we can protect workers and the public in the remaining 20 largest cities, 16 million people would be better protected from cancer and heart disease caused by secondhand smoke." Keep clicking to find out which major cities won't let you smoke indoors... istockphoto


smoking, businessman, lawyer, cigarette, stock, 4x3, smokeLike air pollutants, cigarette and cigar smoke can also irritate your nose and cause inflammation, thereby making you more susceptible to sinus infections.

"People who smoke may be at higher risk [of sinus infections], because their natural sinus-cleaning system is damaged by cigarette smoke," says Dr. Hueston. "So they accumulate more 'junk' in the sinuses, which can clog passages when they have a cold."

13 sneaky causes of sinus trouble

A woman using a neti pot to clear her sinuses. FDA

Lack of moisture or dry air

When mucus is trapped in the nasal passages for long periods of time, it can lose water and thicken. The result? It worsens symptoms and makes sinusitis more likely.

Therefore, doctors recommend you keep your nose as moist as possible. Start by drinking lots of water and avoiding caffeine, and use a humidifier to keep indoor air moist during the winter.

The occasional use of nasal irrigation treatments, like saline sprays, may also help treat or prevent sinusitis symptoms.

13 sneaky causes of sinus trouble

Analgesic medications, such as prescription painkillers, were responsible for 31 percent of young children's fatal poisonings in 2010, according to Safe Kids Worldwide. istockphoto

Unusual anatomy

kid, child, headache, little girl, stock, 4x3, migraineYou may be at higher risk of sinus infections if you were born with a nasal abnormality or polyps, says Dr. Hueston.

Narrow drainage passages, tumors, or a cleft palate can block openings in the sinus, preventing mucus drainage.

The mucus can then get infected with viruses or bacteria, says Dr. Bains. A deviated septum - when the center section of the nose is shifted to one side - is often associated with chronic sinus infections, as are enlarged adenoids, tissue masses in the passage between the throat and nasal cavity that trap and destroy germs.

Surgery may be necessary to correct these abnormalities.

13 sneaky causes of sinus trouble

It's not always easy keeping track of complicated medical information, especially when you're sick and worried. That's why it's often a good idea to have an advocate with you in the hospital - a friend or family member who can sit with you and ask questions on your behalf when you're not quite up to the task. istockphoto

Chronic medical conditions

Chronic conditions, such as cystic fibrosis and other disorders that weaken your immune system, can lead to inflammation in the airways and make you prone to developing thick mucus.

This thicker mucus, or an impaired ability to fight germs due to diabetes or HIV infection, can set the stage for sinus infections.

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