What Causes Difficulty In Breathing After A Fall?

hi i want to ask abt my mom 4 days back she fell and become un concious .she is having problem in breathing ...heart and other orgnas are funtioning correctly....doctors are unable to find the correct reason ....today she had done a small surgery in the neck for breathing.......MRI has not done till now because of breathing problem....could u plz tell wht the reason behind dis...