Can a malocclusion (abnormal bite) cause a deviated septum?

No: Many people can have both but there is no direct cause and effect relationship between the two.

No: A malocclusion is caused by misalignment of either the teeth or the jaws and is an independent condition from a deviated septum.

No: Roof of the mouth is the floor of the nose, so there can be deviated septum and high narrow palatal vault at same time. They may be coincident but one does not cause the other. Sounds like you should be examined by both orthodontic specialist and ear/nose/throat specialist, and then ask them to consult with each other.

Which came first: Was the septum and roof of your mouth normal and then change as the malocclusion got worse and vaulted the roof of the mouth? Was your septum deviated at birth? Sometimes knowing the cause is not as important. If you have both fixed will you have to worry about a recurrence, probably not.

No: An abnormal bite cannot cause a deviated septum. However, because the upper jaw is attached to the upper face including the nasal cavity, an abnormal bite with an underlying facial asymmetry can be associated with a deviated septum.

Deviated septum: A deviated septum is a common issue. It can be caused by trauma, position in utero and even during the birth process. If there are symptoms like nasal obstruction, snoring or recurrent sinusitis, have your nose evaluated by a board certified otolaryngologist.