Slices through the confusion and the contradictions with grace and compassion. I cannot say good enough things about it. - CHRIS VAN TULLEKENBe prepared for compassionate and bracingly independent thinking - THE TIMES, best books of 2025From autism to allergies, ADHD to long Covid, more people are being labelled with medical conditions than ever before. But can a diagnosis do us more harm than good? The boundaries between sickness and health are being redrawn. Mental health categories are shifting and expanding all the time, radically altering what we consider to be normal. Genetic tests can now detect pathologies decades before people experience symptoms, and sometimes before theyre even born. And increased health screening draws more and more people into believing they are unwell. An accurate diagnosis can bring greater understanding and of course improved treatment. But many diagnoses arent as definitive as we think. And in some cases they risk turning healthy people into patients. Drawing on the stories of real people, as well as decades of clinical practice and the latest medical research, Dr Suzanne OSullivan overturns long held assumptions and reframes how we think about illness and health.