What is sinusitis (sinus infection)?
Sinusitis, or rhinosinusitis, is more commonly called a sinus infection. The condition occurs when the sinuses become inflamed or infected.
Everyone has four pairs of sinuses, which are hollow spaces in the bones, around the nose:
- Maxillary sinuses: Located below the eye sockets
- Ethmoid sinuses: Located between the eye socket and the nasal cavity
- Frontal sinuses: Located right above the eyebrows
- Sphenoid sinuses: Located deep in the nose behind the ethmoid sinuses
Young children only have maxillary and ethmoid sinuses — the frontal and sphenoid sinuses develop in the teen years.
Healthy sinuses are filled with air. When sinuses get inflamed or infected, the lining thickens and bacteria-filled mucus fills the sinus cavity.
Doctors classify sinus infections by how long they last:
- Acute: Infections lasting up to 4 weeks
- Subacute: Infections lasting 4 to 12 weeks
- Chronic: Infections lasting more than 12 weeks
- Recurrent: Infections that occur repeatedly, with short intervals of no symptoms in between
What causes sinus infections in children?
Sinusitis generally starts as a viral upper respiratory infection such as the common cold. Cold symptoms that last longer than 10 days increase the chance of a sinus infection.
When your child has a cold, the lining of their nose and sinuses gets inflamed and swollen. Many different types of bacteria, including those that cause sinusitis, can then move into the nasal cavity.
Other risk factors that increase the chances of sinus infections in children include:
- Being in a school or daycare setting
- Having older siblings
- Being around pets
- Exposure to secondhand cigarette smoke
- Exposure to other environmental allergens
- Deviated septum, enlarged adenoids or other structural differences
How common are sinus infections in children?
Children get colds more often so they are likely to get acute sinusitis at some point. Only a small number of children develop chronic sinusitis. However, an immune deficiency or weakened immune response increases the risk of chronic sinusitis.
Why does my child keep getting sinus infections?
Research shows a link between allergic diseases, such as hay fever and asthma, and recurrent sinus infections. Other conditions that increase the risk of recurrent sinusitis in children include:
- Resistant bacteria
- Cystic fibrosis
- Anatomic differences, such as a deviated septum or enlarged adenoids
Resistant bacterial infections are infections with bacteria that don’t respond to antibiotics. They occur with repeated antibiotic use, or from infections caused by resistant bacteria that spread from person to person. Even when treated with antibiotics, resistant bacteria continue to multiply — making these infections difficult to treat. Instances of resistant bacterial infections are rare.
Children with compromised immune systems, such as those with cancer, type 1 diabetes and type 2 diabetes, can get invasive fungal sinusitis (an infection that occurs after inhaling certain types of fungus) in addition to bacterial sinusitis. For these children, the condition can become fatal without proper treatment.
How do we diagnose sinus infections in children?
Generally, we diagnose acute sinusitis based on symptoms that last longer than 10 days after a cold.
If your child has chronic sinusitis, we may recommend an extended periods of taking antibiotics (about 20 days), along with nasal saline washes and steroid nasal spray. If the infection remains, your child’s doctor may recommend a CT scan to rule out complications from acute sinusitis or to diagnose chronic sinusitis. Occasionally, they may use other imaging tests like magnetic resonance imaging (MRI) or X-rays to get an more detailed image of inside the nasal cavity.
What can I expect from imaging tests?
A CT scan takes less than three minutes. An MRI scan takes 30 minutes. Children older than 7 years are generally able to lie still for an MRI. Younger children might require sedation or anesthesia to keep them comfortable during these tests.
Why choose Children’s Hospital Colorado for imaging studies?
Our Radiology Department only does imaging scans for children. We understand how to make these tests more comfortable and less scary for kids. When possible, we use spiral CT technology, which makes scans faster and uses a lower dose of radiation.
How do we treat sinus infections?
In general, our doctors do not recommend antibiotics to treat cold symptoms that have lasted fewer than 10 days. That’s because a cold is a virus, and antibiotics aren’t effective against viruses.
If your child’s cold progresses to acute sinusitis, we may treat it with an antibiotic to treat the bacteria found in the mucus in the nose. If your child has significant nasal congestion, their doctor may also recommend a topical nasal decongestant.
How do we treat chronic sinus infections in children?
Chronic sinusitis is more difficult to treat. Primary treatment includes:
- Antibiotics (generally at least for 20 days)
- Nasal saline washes
- Nasal steroid sprays
Children with chronic sinusitis that does not respond to antibiotics may need additional treatment, which can include:
- Antral irrigation to wash out the maxillary sinuses (located in the cheeks, next to the nose)
- Targeted antibiotic therapy
- Adenoidectomy is a surgery to remove the adenoid, lymphoid tissue located behind the nose. Adenoids help build up the body's immunity by trapping viruses that enter through the mouth. But enlarged adenoids can cause chronic sinusitis or sleep issues and no longer provide health benefits.
In older children and children with cystic fibrosis, we may recommend endoscopic sinus surgery to open the sinus passages and allow them to work more effectively.
In rare cases, children may develop serious eye problems or other infections from chronic sinusitis. In these cases, your child may be admitted to the hospital for antibiotics given through an IV or surgery.
How can I treat my child’s sinus infection symptoms at home?
If your child’s symptoms last longer than 10 days, they should see a doctor to get the condition accurately diagnosed.
For nasal symptoms that less than 10 days, there are several things you can try at home:
- Gentle nasal irrigation or suctioning for nasal secretions
- Short-term use of nasal topical decongestants (generally 4 days or less)
- Acetaminophen or ibuprofen for fever control
Why choose Children’s Colorado for your child’s sinusitis?
The Sinusitis Clinic at Children's Colorado has more than two decades of experience treating kids with sinus infections. Our pediatric otolaryngologists (ear, nose and throat doctors), infectious diseases specialists, allergists and immunologists are experts at diagnosing and treating sinusitis in children.
This multidisciplinary clinic combines ear, nose and throat experts from our Department of Pediatric Otolaryngology with specialists from other departments so your child can see everyone specialist then need in one place. Our clinic also gives you access to any diagnostic testing your child may need. And because our doctors are at the forefront of research on sinusitis in children, we offer the latest in treatment for all types of sinusitis.
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