The horrible state of affairs can be : pass initial CAAC medical, join airline xyz on $20000/ month. Happly checked to line you do your next CAAC medical check. Wham, Bam , sorry you failed on your hypoglycemia lateral dimensional resonance scan. Err, WTF you saying Doc?
Well says Dr Zue Xian Me, you go away and you do own test. Pay own money, not my problem. Now you're under massive stress , which raises blood pressure, so next assesment you fail for high blood pressure " above recommended" Bye bye.
Soon you wish you had not had your ears bent by the Chinese $$$ devil.