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."
an extreme case of phoniness usually exhibited by celebrities who preach on about fashionable topics such as poverty or environment and yet do nothing personally to support the cause which they claim to be in favor of.