My friend has been noticing when he bends and reaches for things that he cant breathe as well as if he were standing upright, like he was cutting off his airway when hunched over for short periods. Noticed approximately a week to two weeks. Occupation is factory(manufacturing) worker

My friend would bend over to pick something up off floor or ground and he feels like he cant breathe at all

What did his doctor say when he went for a visit to diagnose this?

It's also just not helpful to go online asking medical questions for someone else.
Symptoms are almost always part of the person's whole situation, starting with age, weight, history, diet, occupation, basic vital signs, and going on into smoking/drinking, on and on.