Conversion disorder is one of several types of somatoform disorders, in which psychological problems produce physical symptoms. These disorders have typically been highly stigmatized, with physicians telling patients that the problem is "all in your head". Research on the connection between mind and body is steadily increasing our understanding of these disorders and should reduce the stigma, as it becomes clear that these conditions are real, cause real distress, and cannot just be turned on and off at will. The onset of symptoms in this disorder is usually very sudden and follows a stressful experience. Loss of function, such as in inability to move a limb, may unconsciously symbolize the underlying conflict associated with the experience. Risk factors include a history of histrionic personality disorder or dependent personality disorder.
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