hypochondriasis

noun

1. (countable, uncountable)A mental disorder (in some classifications of such disorders, including ICD-11) that is characterized by excessive fear of or preoccupation with a serious illness, despite medical testing and reassurance to the contrary.

   “Near-synonym: hypochondria”

   “Most individuals who previously would have been diagnosed with hypochondriasis in DSM-IV [1994] (preoccupation with having a serious disease based on the individual’s misinterpretation of bodily symptoms) are now classified as having somatic symptom disorder; however, in one-third of cases, the diagnosis of illness anxiety disorder applies instead.”