Diagnosis — once the cornerstone of medicine — is fast becoming a lost art, despite aggressive testing that is often unnecessary and can sometimes be harmful. In a talk about her new book, When Doctors Don’t Listen, Dr. Leana Wen empowers patients to engage with their doctors as partners, and avoid the “cookbook diagnoses” that often fail to explain a package of symptoms. The book helps patients paint a full picture of their illness at a medical appointment, deal with doctors who don’t seem to be listening, and get a working diagnosis at the end of every visit.