Cancer in a dream is traditionally read as a fear or resentment growing quietly inside, or a situation that is spreading beyond your control. Being told you have it is usually taken as shock at something you suddenly have to face, while a loved one with the illness points to worry for them or fear of losing them. Recovering in the dream is read as hope that a heavy matter can be resolved. It is a symbol of worry, never a diagnosis or a forecast. It can help to ask what has been eating at you lately.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.