This is a more difficult issue. Whilst the battle to reduce prejudice against people with Multiple Sclerosis at work is gradually being won for people in their current jobs, many employers still have a concern about promoting people with the condition. In your current job you will have proved yourself, that is almost certainly why you are applying for promotion, and thus your employer – presumably – is likely to be satisfied with your work in that job. However, he or she may find the combination of your promotion to a new position where you will not yet, of course, have demonstrated your competence, and a condition with variable symptoms, difficult to be positive about. So, if you tell your employer about your MS, you should stress the qualities that you have (unaffected by the Multiple Sclerosis), and how important these would be for the job you are going after. It may well be that your previous skills and experience are such that a positive decision on promotion is relatively easy.