--> SInus in brief.

Sinus.
The sinuses are cavities, or air-filled pockets located around the nose. Like the nasal passage, the sinuses are lined with mucous membranes.

There are four different types of sinuses:

Ethmoid sinuses - located inside the face, around the area of the bridge of the nose. These sinuses are present at birth, and continue to grow.

Maxillary sinuses - located inside the face, around the area of the cheeks. These sinuses are also present at birth, and continue to grow.

Frontal sinus - located inside the face, in the area of the forehead. This sinus does not develop until around 7 years of age.

Sphenoid sinuses - located deep in the face, behind the nose. These sinuses do not develop until adolescence

Sinusitis:
Sinusitis means an inflammation or irritation of the sinuses.
This inflammation can be caused by a number of factors including a bacterial infection, viral infection and allergies.

Acute sinusitis - occurs quickly and improves with the appropriate treatment.

Chronic sinusitis - occurs with repeated acute infections or with previous infections that do not completely get better. The symptoms last longer than three months.

Causes of Sinusitis :
In children, a sinus infection often occurs after an upper respiratory infection or common cold. Viruses cause these respiratory infections. Respiratory infection causes swelling of the nasal passages that can block the opening of the sinuses, and result in a sinus infection.

In children, a bacterial infection may follow closely after this viral infection. Allergies can also lead to sinusitis because of the swelling of the nasal tissue and increased production of mucus.

There are other possible conditions that can block the normal flow of secretions out of the sinuses and can lead to sinusitis including the following:
Abnormalities in the structure of the nose
Enlarged adenoids
Trauma to the nose
Foreign objects stuck in the nose
Problems with the immune system
Cystic fibrosis
Children at Risk for Getting Sinusitis The following are some of the factors that may increase your child's risk of developing sinusitis:
Spends time in a daycare setting
Being around someone who smokes
Family history of sinusitis
Having a cold
A poor immune system.