“Everybody lies” is the recurring phrase associated with Dr. House's view of human behavior in House M.D.
House uses the phrase to express his belief that patients, colleagues, and other people routinely conceal information or distort the truth. In the show's diagnostic logic, an incomplete or false patient history can mislead doctors, so House treats skepticism as a practical medical tool rather than merely a personality trait.
The line became one of the program's most recognizable quotations. It also summarizes a central tension in the series: House distrusts people, yet solving an illness often requires understanding motives, fear, embarrassment, and the reasons someone might hide a fact.
The phrase should not be confused with “Everybody Dies,” the title of the series finale. The two statements are thematically related, but “Everybody lies” is the recurring House maxim about human behavior.