Dream of such thing, forewarns you to be more aware of your health.
Dream dictionary: Incubus dream meanings
In the dream to have interaction with fiend, incubus or monster, denotes your inner demons. Fiend is interpreted also as suggestion that you need to confront your dark past. The dream also has deep meaning and stands as an omen of unpleasant emotion caused by the belief that someone or something is dangerous. And sometimes monsters symbolize inner anger.