Malingering is when a person exaggerates or makes up a physical or psychological illness or injury to seek personal gain (such as paid sick leave, worker's compensation, avoiding military duty, obtaining financial compensation, obtaining drugs). It is a voluntary behavior directed toward achieving a certain goal. It is not thought to be a form of mental illness. But it can exist in the context of other mental illnesses.

Malingering is not considered a mental disorder. It occurs when a person intentionally fakes symptoms for personal gains. It is caused by external factors that motivate the malingering. It is often associated with antisocial personality disorder.