ongoing preoccupation about one's health and fear of having a disease, despite medical reassurance that none exists.
a somatoform disorder in which the person interprets the slightest physical changes as evidence of a serious illness. (490)
A somatoform disorder in which the person, misinterpreting rather ordinary physical sensations, is preoccupied with fears of having a serious disease and is not dissuaded by medical opinion. Difficult to distinguish from somatization disorder.