Hyperchondriac
As opposed to hypochondriac, a hyperchondriac is a person who thinks they are alright, even if there is medical evidence of their sickness. Some people usually have a fear of getting sick, this fear lead to anxiety which may affect a person mentally. But hypercondriac people don’t have any worries about their health status, and they try to lead a life irrespective of their illness.
Donald: "There's nothing wrong with me, I feel phenomenal. Having been diagnosed with an illness means nothing to me. Leave me alone. Looser!"
Sam: "You're a hyperchondriac."
Sam: "You're a hyperchondriac."
hyperchondriac
someone who has insufficient interest in his health; opposite of hypochondriac
Jim is such a hyperchondriac that he ignore all warning signs until he was really, really sick