mouthbreather from childhood. Combination of overbite ( braces did not help) recurring ear-infections and too big tonsils ( operated upon several times, grew back)
Other reason for mouth-breathing can be over breathing. During my severe state I over-breathed in the night. More commonly known as chronic hyperventilation. this is due to high stresses in the body.
My normal breathing-pattern is very slow, has been like that for many years, think here about 3 or 4 per minute in rest. In general over-breathing is anything above 12 per minute if I remember it well.
Chronic hyperventilation is commonly thought to be caused by too much mental stress, ( then after stress has gone the breathing pattern does not easliy go back to normal due to changed buffering capacity of the blood)
But after having had it again due to severe ME I know that bodily stress ( illness/ infection etc.) can cause over-breathing ( and thus mouthbreathing) as well.
I think/believe that the changed buffering capacity in the blood also leads to nose tending to be stopped up, in this way perpetuating the problem.
Might look up Buteyko, this is a therapy that aims to reverse chronic hyperventilation.
I did another therapy for it ( many many years ago)
