Examination and diagnosis in dreams, if favorable, indicates that you feel secure and satisfied in waking life.
If you are diagnosing illness in a dream, this points to insecurity and an over-sensitive approach to life.
If you dream that you are diagnosed with a fatal illness or have a fatal illness, it might be worthwhile seeing your doctor for a check-up as illness has been diagnosed in this way before; typically, however, such dreams represent any condition or situation that you feel is taking you away from the life you were meant to live.
There is a big difference between existing and leading a life that is worth living, and your dreaming mind may be urging you to find ways to live your life to the full, before it is too late.... The Element Encyclopedia