obsessive-compulsive disorder
offensive
an offensive word that is used to describe someone who worries a lot about small details and has a strong dislike of anything that is not perfect, or to describe the behaviour of someone like this（贬）强迫症的

Note:

It is considered offensive to use this word when talking about ordinary worries or actions that a person chooses to do, because it suggests that people with obsessive-compulsive disorder have chosen their condition and that it is not serious.
Prader-Willi syndrome is an illness characterized by insatiable appetite, low muscle mass and obsessive-compulsive behavior.
Serotonin can help regulate excessive anxiety and obsessive-compulsive thoughts.

SMART Vocabulary: related words and phrases

Mental illnesses
ad
adjustment disorder
age-associated memory impairment
anhedonia
anorectic
exhibitionistic
exhibitionistically
false memory
firebug
generalized anxiety disorder
manic depression
melancholia
mental handicap
neurotic
postpartum depression
postpartum psychosis
PPD
progressive simultanagnosia
psychopathy
schizophrenic