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 :-

  • Viruses
  • Bacteria
  • Fungus
  • Excessive nose blowing
  • Foreign objects in nostril (especially in children)
  • Scuba diving
  • Side effects of certain drugs
  • Tooth caries
  • Allergies


  • Cough with production of mucus
  • Discharge from the back of the nose into the throat
  • Bad breath
  • Reduced sense of smell/ taste

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