Sinuses are moist air spaces within the bones of the face around the nose. When they become infected and swell or become irritated, this is called sinusitis (or a sinus infection). These infections usually follow colds or bouts with allergies. Sinusitis is common and easily treated.
Causes
The sinuses are four sets of hollow spaces that are located in the cheekbones (maxillary sinus), the forehead (frontal sinus), behind the nasal passages (ethmoid sinus), and deep in the brain behind the nasal passages (sphenoid sinus). Sinuses are lined with the same mucous membranes that line the nose and mouth.
When someone has a cold or allergies and the nasal passages become swollen and make more mucus, so do the sinus tissues. The drainage system for the sinuses can get blocked, and mucus can become trapped in the sinuses. Bacteria, viruses, and fungi can grow there and lead to sinusitis.
Symptoms
Sinusitis can cause different symptoms for kids of varying ages.
Younger kids often have cold-like symptoms, including a stuffy or runny nose and slight fever. If your child develops a fever 5-7 days after cold symptoms begin, it could signal sinusitis or another infection (like bronchitis, pneumonia, or an ear infection), so call your doctor.
Many parents mistake cold-related headaches in young kids for sinus infections. But the sinuses in the forehead don't start developing until kids are 6 or 7 years old and aren't formed enough to get infected until the early teen years. So headaches in kids who have colds usually aren't sinus infections.
In older kids and teens, the most common sinusitis symptoms are a cough that doesn't improve after the first 7 days of cold symptoms, fever, worsening congestion, foul breath, dental pain, ear pain, or tenderness in the face. Sometimes, teens who have sinusitis also develop upset stomachs, nausea, headaches, and pain behind the eyes.