Generally, it is considered that the disease dreamed does not promise anything bad. Rather such dream will mean the general wellbeing or the future changes. However in certain cases dreams about various diseases can promise loss of influence or severe financial losses. Usually it is defined by how treats a disease of people to which it dreamed.
If the disease causes feeling of fastidiousness and disgust, then the value of a dream, most likely, will be bad. If the illness is accompanied compassion, pity, desire to help, sincere experiences, then the dream promises something good.
Dreams in which health workers or institutions appear usually symbolize a certain responsibility or certain obligations. What obligations and as they will be connected with sleeping will be, depends on details of a concrete dream.
Be sure and keep any other thoughts out of your mind before drifting to sleep as a cluttered mind can decrease the chances that you will remember your dreams upon waking. Also, focusing on remembering your dreams upon waking in the morning is another very important thing. This sounds very easy, but is often hard for some to do. Interpret a dream by "dictionary dream of interpretation"
When you very first wake up, simply think about your dreams. Don't allow your mind to drift off to other things, just lay there and think about the things you dreamt about the night before - dictionary dream meaning.