I found this: What are the health requirements i.e. Immunisation, medical examination etc. For staff on cruise ships? Once you are offered employmen, all applicants must pass a medical examination by designated cruise line physicians (cruise lines have their own list of physicians for every country).
Applicants will be responsible for the cost of the examination (about $60-70 US). Some cruise lines might reimburse crew members for that cost after joining the vessel. You must be physically fit to work on a cruise ship.
So if you are fit, you can work in a cruise ship. But you have to pass the physical exam. I would say that if your diagnosis is serious, and you have problems walking long distances, not sitting for a long time, etc, you probably should not choose this type of work.
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