The sinuses are cavities, or air-filled pockets, that are near
the nasal passage. The sinuses make mucus, which is a fluid that
cleans the bacteria and other particles out of the air we
breathe. There are four different types of sinuses: Sinusitis is
an infection of the sinuses near the nose. These infections
usually occur after a cold or after an allergic inflammation.
There are four types of sinusitis: Sometimes, a sinus infection
happens after an upper respiratory infection (URI) or common
cold. The URI causes inflammation of the nasal passages that can
lead to obstruction of the opening of the paranasal sinuses,
which can lead to infection in the sinuses. Allergic disease 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. These may include:
After the blockage of the flow of secretions from the sinuses,
bacteria will sometimes