Also known as: AV fistula
A college sophomore presents with hemoptysis and recurrent infections. House eventually diagnoses an arteriovenous fistula in her intestine caused by caustic ingestion during a suicide attempt, creating a bridge that allows bacteria to enter the arterial system and cause systemic infections.
Also known as: Chemical burn to digestive tract
Addie's underlying condition originated from intentionally swallowing kitchen cleanser in gel caps during a suicide attempt, which burned a hole in her intestine that healed with scar tissue forming the arteriovenous fistula.
Also known as: HUS
Addie develops hemolytic uremic syndrome as a complication of her recurrent bacteremia, leading to acute kidney shutdown and requiring immediate intervention.
Also known as: Depression
Addie has chronic depression that led to her suicide attempt by caustic ingestion. House reveals this to her parents at the end despite her wishes, recommending therapy and medications.
Also known as: Depression
Wilson is revealed to be taking antidepressants, which House discovers through observing Wilson's yawning as a side effect. This subplot explores Wilson's mental health and House's invasive investigation methods.