This may be highly confusing for anyone who has been diagnosed with either a deviated septum or with sinusitis (a type of infection of the sinuses).
A septum is the thin cartilage and bone dividing the nostrils into two halves. Unfortunately, when you have a “deviated” septum, your septum is not in its rightful place (the center), but slightly inclined on one side.
But sinuses are tiny air pockets located within the bones of the face. “How on earth can there be deviated septum sinus infections”, you ask!