Illness of the blood is read in dreams as a threat to your life force — fear that the very source of your energy or family bonds is under strain. It is a symbol, never a diagnosis.
Has this come up in your dreams before? What was going on in your life then?
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.