Illness Anxiety Disorder was previously known as which of the following?

Illness Anxiety Disorder is the term currently used in the DSM-5 to describe individuals who experience excessive worry about having a serious illness, despite lacking significant medical symptoms. This condition was previously referred to as Hypochondriasis. The reclassification seeks to better capture the nature of the disorder, focusing on the anxiety regarding health rather than on specific somatic symptoms.

Hypochondriasis was characterized by a preoccupation with the fear of having a serious disease for at least six months, often leading to significant distress and impairment in social, occupational, or other important areas of functioning. This terminology change aimed to reduce stigma and emphasize the anxiety aspect of the disorder.

The other terms listed represent different conditions. Conversion Disorder involves neurological symptoms that cannot be explained by medical conditions or direct physiological effects. Somatic Symptom Disorder includes a focus on somatic symptoms (physical symptoms) that cause distress or impairment, while Factitious Disorder involves individuals feigning illness or injury for the purpose of assuming the sick role. Each of these reflects different mechanisms and presentations that do not align with the features of Illness Anxiety Disorder.