Foreshadowed by something negative

At the start of the short story the narrator foreshadows that the main character was mentally ill by already by saying “It’s true! Yes, I have been ill very ill”. They went on to explain that the main character’s illness did cause a mental change “made my mind, my feelings, my senses, more powerful”. This already ‘odd’ behavior or not ‘normal’ human behavior. They never state throughout the story they have gotten better, therefore making the reader more sceptical of whether or not this person is the right mind or not. 

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