In House M.D., what medical condition is Dr. Remy Hadley diagnosed with?

In House M.D., Dr. Remy Hadley is diagnosed with Huntington's disease.

Huntington's disease is an inherited neurodegenerative disorder caused by a mutation in the HTT gene. It can affect movement, cognition, and mood, and symptoms usually appear in adulthood. The condition is autosomal dominant, meaning a person who inherits one altered copy of the gene can develop the disease.

The diagnosis is central to Thirteen's character arc. Her mother died from Huntington's disease, so Thirteen knows she has a substantial inherited risk before undergoing testing. The storyline explores the uncertainty of genetic testing, the fear of future symptoms, and the effects of a serious diagnosis on relationships and medical choices.

The show uses the condition as a fictional character storyline rather than a complete medical guide. Huntington's disease is not the same as Parkinson's disease or multiple sclerosis, although all can involve neurological symptoms. In House M.D., the diagnosis belongs specifically to Remy Hadley, played by Olivia Wilde.