Ever since he was a child and was teased about being slightly overweight, Chester has had a severe obsessions with his waistline. He is now 34 years of age, is slim and healthy, and works out constantly. Despite the fact that he has a perfectly flat stomach with "washboard abs," he still perceives himself as having a pot belly. He is very anxious about this perception, and finds it to be intrusive in his life. Chester may be suffering from disorder.

body dysmorphic

Explanation:

Body dysmorphic disorder: In abnormal psychology, the term "body dysmorphic disorder is described as one of the mental health disorders whereby an individual isn't able to quit thinking about a few perceived flaws or defects in his or her appearance (an individual tends to see the flaws or defects that is not distinguishable for any other person). Instead, an individual feels anxious, embarrassed, and ashamed that he or she is willing to avoid or ignore a lot of social situations or gatherings.

The treatment-related to body dysmorphic disorder is "cognitive behavioral therapy".

In the question above, Chester may be suffering from body dysmorphic disorder.