Two women have credited ChatGPT, the artificial intelligence chatbot, with helping to detect serious cancers that were initially missed by medical professionals. Lauren Bannon, a 40-year-old marketing company owner who splits her time between North Carolina and the US Virgin Islands, experienced rapid weight loss and severe stomach pain. After doctors misdiagnosed her symptoms as acid reflux and rheumatoid arthritis, she consulted ChatGPT, which suggested Hashimoto's disease and recommended a thyroid peroxidase antibody (TPO) test. Despite her doctor's skepticism and no family history of thyroid disease, Bannon insisted on the test, telling her doctor to "just amuse me." The subsequent scan revealed two small cancerous lumps in her neck, leading to a diagnosis of thyroid cancer. Bannon stated that without ChatGPT, her cancer would have spread from her neck to the rest of her body. In a separate case, Marley Garnreiter, a 27-year-old from Paris, used ChatGPT to analyze her symptoms of night sweats and skin irritation after routine medical tests failed to identify a cause. The AI tool flagged the possibility of blood cancer, which she initially ignored. Garnreiter, whose father had died of colon cancer, later developed chronic fatigue and chest pain. Medical scans then revealed a large lump in her left lung, resulting in a diagnosis of Hodgkin lymphoma. Medical experts note that the five-year survival rate for Hodgkin lymphoma exceeds 80 percent when identified early. While both women credit ChatGPT for prompting further medical investigation, experts caution that AI tools should be used as a supplement rather than a replacement for professional healthcare advice.