What is a common sign of a functional disorder?

A common sign of a functional disorder is the presence of impaired bodily functions without any observable structural abnormalities. Functional disorders can affect how a body system works, even though medical imaging or examinations may not reveal any physical changes or injuries. For instance, a person may experience chronic pain or gastrointestinal issues, yet tests such as X-rays, MRIs, or blood tests may show normal results. This indicates that the problem lies in the way the body is functioning rather than in its physical structure.

In contrast, visible structural damage would indicate an anatomical problem rather than a functional disorder. Inability to communicate might suggest a behavioral or psychological issue rather than a specific functional disorder. Clear psychological disturbance could accompany functional disorders, but by itself, it does not define the concept; functional disorders may exist without overt psychological symptoms as well. Thus, the identification of impaired bodily functions without structural abnormalities directly relates to the characteristics of functional disorders.