Also known as: Mothball/termite nest poisoning
A 16-year-old boy presents with hemolytic anemia, internal bleeding, and liver failure after a car accident. The team initially suspects lupus, but House discovers the cause is naphthalene toxicity from termites in the boy's bedroom walls. The poison was stored in his fat cells and released when he lost weight in the hospital, causing his symptoms to worsen despite being away from the environmental source.
Also known as: Retinal clot
Keith develops sudden vision loss in his left eye due to a retinal blood clot. House successfully treats it by removing vitreous humor to create space for the artery to expand, allowing the clot to move and restoring vision.
Also known as: Heroin addiction
House accepts a bet from Cuddy to go one week without Vicodin to prove he's not addicted. He experiences withdrawal symptoms including pain, nausea, and erratic behavior. By the end, he admits he's an addict but refuses to stop because the pills allow him to function and do his job.