To dream that you have an illness denotes despair, unpleasant changes, or some emotional breakdown. The illness may be symbolic of your inability to cope with a situation. You see that being ill is an easy way out. On a more direct note, this dream may signal you to pay closer attention to your health especially to the areas of body revealed in the dream.
In particular, to dream that you have a terminal illness or disease implies that you are living on “borrowed time”. The dream is a reminder that life is too precious and that you need to make the most of your time everyday. Alternatively, to have a terminal illness in your dream signifies hopelessness, grief and self-pity. What area of your life is making you feel this way?