Can having your bent looking down for many hours cause eustachian tube dysfunction?

Not likely.: Eustacian tube dysfunction is caused when the eustacian tube, which connects the ear to the nose, can not drain properly. This usually is caused by inflammation due to an ear infection, cold, sinus infection, allergies or the like. Looking down does not effect the angle of the tube, nor should it cause the tube to become clogged or inflamed in any way.