All are causes of intellectual disability except

A. Overreaction of a medical symptom. While individuals with illness anxiety disorder (IAD) may misinterpret normal bodily sensations as signs of serious illness, the key feature is excessive health-related worry in the absence of significant symptoms, rather than just overreacting to existing symptoms.

B. Faked symptoms. Feigning symptoms is characteristic of factitious disorder (formerly Munchausen syndrome) or malingering, where individuals intentionally produce or exaggerate symptoms for attention or external gain. In IAD, the concern is genuine but unfounded, rather than intentionally fabricated.

C. Abnormal voluntary motor or sensory dysfunction. This describes conversion disorder (functional neurological symptom disorder), where individuals experience neurological symptoms (e.g., paralysis, blindness, or seizures) without a medical explanation, typically triggered by psychological stress.

D. Worry about health despite no symptoms. Illness anxiety disorder (IAD) is marked by persistent, excessive fear of having a serious illness, despite minimal or no symptoms and repeated medical reassurance. Patients often engage in excessive health-related behaviors (e.g., frequent doctor visits, checking their body) or avoid medical care altogether due to fear of diagnosis.

A. Severe temper outbursts. Disruptive Mood Dysregulation Disorder (DMDD) is characterized by frequent, severe temper outbursts that are out of proportion to the situation. These outbursts can be verbal or physical and occur at least three times per week, persisting for one year or more.

B. Struggle to regulate emotions. Individuals with DMDD have difficulty managing emotions, particularly anger and frustration. This emotional dysregulation leads to persistent mood instability, which interferes with daily functioning at home, school, and in social settings.

C. Hyperactivity. Hyperactivity is not a core symptom of DMDD but is more commonly associated with Attention-Deficit/Hyperactivity Disorder (ADHD). While some children with DMDD may also have ADHD, DMDD primarily involves severe mood disturbances rather than impulsivity or excessive movement.

D. Chronic irritability. Persistent irritability is a hallmark of DMDD, with children and adolescents experiencing near-constant irritability between temper outbursts. Unlike episodic mood disorders like bipolar disorder, DMDD symptoms are chronic and ongoing without distinct mood episodes.