In House M.D., what disease does Thirteen fear inheriting from her mother?

In House M.D., Thirteen fears inheriting Huntington’s disease from her mother. Huntington’s is an inherited neurodegenerative disorder caused by a mutation in the HTT gene and is passed through families in an autosomal dominant pattern.

The diagnosis becomes a major part of Thirteen’s character arc. She learns that she carries the disease-causing mutation, meaning she is expected to develop symptoms later in life, although the timing and severity cannot be predicted precisely from the result alone.

Her storyline also explores the emotional consequences of genetic testing, including uncertainty, relationships, and decisions about parenthood. These themes distinguish Thirteen’s personal medical history from the individual patient cases investigated by House’s team.

The condition is sometimes confused with Parkinson’s disease because both can involve movement problems. Huntington’s disease, however, is specifically central to Thirteen’s family history and identity in the series.