Factitious diarrhea refers to the production of diarrhea symptoms by an individual, without any organic cause. It is a disorder that can be caused by various reasons such as psychiatric disorders, anxiety, depression, or by the intentional ingestion of substances that can cause diarrhea. There are several synonyms or related terms used to describe the different causes of factitious diarrhea. These include Munchausen syndrome, pseudodiarrhea, functional diarrhea, and functional gastrointestinal disorder. Munchausen syndrome is a mental disorder characterized by the fabrication of symptoms or self-injury to gain attention or sympathy, while pseudodiarrhea is a term used to describe diarrhea-like symptoms that do not have an organic cause. Functional diarrhea and functional gastrointestinal disorder refer to a group of disorders that cause gastrointestinal symptoms without an identifiable cause.