What is a sinus?
A sinus is a hollow, air-filled cavity in the skull and connected to the nasal airway by a narrow hole in the bone (ostium).
- frontal sinus (in forehead).
- maxillary sinus (behind cheeks).
- ethmoid sinus (between the eyes).
- sphenoid sinus (deep behind the ethmoids).
Types of sinus:-
- Sinusitis may be classified in several ways, based on the time span of the problem (acute, subacute, or chronic) and the type of inflammation (either infectious or noninfectious).
- Infected sinusitis usually is caused by uncomplicated virus infection.
- Less frequently, bacterial growth causes sinus infection and fungal sinus infection is very infrequent.
Picture of the anatomy of the sinuses
Causes of Sinus :-
- Excessive nose blowing
- Foreign objects in nostril (especially in children)
- Scuba diving
- Side effects of certain drugs
- Tooth caries
- Cough with production of mucus
- Discharge from the back of the nose into the throat
- Bad breath
- Reduced sense of smell/ taste