“Three Stories” is the House M.D. episode that uses three patient cases to explore medical diagnosis. It is the 21st episode of the show's first season and was written by David Shore.
The episode presents House teaching medical students while recounting three apparently separate diagnostic stories. Its structure gradually reveals how the cases connect to House's own medical history, giving viewers important information about his leg injury and chronic pain.
“Three Stories” is widely regarded as one of the series' landmark episodes. It won the Primetime Emmy Award for Outstanding Writing for a Drama Series in 2005. The title is sometimes mistaken for a reference to three hospital floors, but it specifically describes the episode's narrative structure.