Flight Attendant Question:

A medical evaluation is required to ascertain a standard of health required to perform the duties of a flight attendant and to be able to cope with the aviation environment. Some specifics will be your ability to adjust to the pressure changes that you will experience every day.
This includes having healthy and 'normally' operating Eustachian tubes of your inner ear that equalize pressure as you ascend and descend on every flight. Most people will have absolutely no problem with the ability to equalize pressure. Similarly your sinuses must be able to cope with such pressure changes.