Internet addiction is a clinical disorder marked by out-of-control internet use.

Orthorexia is a controversial eating disorder marked by an obsession with healthy food.

He is best known for treating the first recorded case of the eponymous Morvan's syndrome, a rare neurological disorder marked by acute insomnia.

Read about bulimia nervosa, an eating disorder marked by binge eating followed by purging.

It's a behavioral disorder marked by impulsiveness, hyperactivity, and inattention.

Developmental topographical disorientation, a cognitive disorder marked by inability to navigate within the environment.

Hyperhydrosis is a disorder marked by excessive sweating.

Dependency is not the same as addiction, which is a behavioral disorder marked by craving a drug.

Alzheimer's is an irreversible brain disease that destroys memory, and it is one form of dementia, a disorder marked by the loss of mental functions.

Lafora disease is a rare genetic disorder marked by the presence of abnormal polyglucosan deposits.