Polio, an illness of the past, is read in dreams as something that once threatened movement and freedom. Dream books link it to old fears of being held back that echo into the present.
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.