Poppy Guy, a 29-year-old British mother of two from Cornwall, experienced vomiting, shortness of breath, dizziness, and nearly black skin discoloration during a family vacation in Málaga in late May. For months, her family doctor attributed her symptoms to an anxiety disorder, and prescribed medications did not help. After describing her symptoms to ChatGPT, the chatbot suggested Addison's disease, a rare condition where the adrenal glands produce too few essential hormones and which can be fatal if untreated. Guy returned to her doctor and was referred to the hospital. One week later, she collapsed while cooking at home, and the hospital confirmed an Addisonian crisis, a life-threatening exacerbation. A doctor told her that without hospital admission that day, she would likely have died. She was treated with an IV for two weeks and now takes eleven pills a day, relies on a wheelchair and a walker, and can manage only about twenty meters at a time. Her skin color has not returned to normal. The diagnosis was made by a doctor, and OpenAI emphasizes that ChatGPT is not a doctor and does not replace diagnosis or treatment.