6 ideas
Physicians often seize on the first salient piece of information and form a diagnosis within seconds, then stop generating alternatives. Once anchored, they filter later findings to fit the initial hypothesis, so contradicting evidence is dismissed as noise rather than treated as a signal to reopen the case.
A woman labeled with anorexia nervosa and irritable bowel syndrome for about fifteen years kept losing weight despite eating, and each new doctor inherited and reinforced the psychiatric label. A gastroenterologist who set aside her chart and had her retell her history from the start identified celiac disease.
Doctors attribute symptoms to a patient's stereotype, such as alcoholic, anxious woman, or healthy young athlete, rather than to disease. The stereotype supplies a ready explanation that ends inquiry, as when a fit, low-risk-looking man's chest pain is sent home as muscular and he returns with a heart attack.
A physician's liking or dislike of a patient changes the quality of the thinking, not just the bedside manner. Dislike leads to dismissiveness and fewer questions, while affection can make a doctor avoid uncomfortable tests or bad news. Good diagnosticians notice their feelings and correct for them.
Clinical algorithms and evidence-based guidelines are built from average cases, so they break down for patients whose presentation is unusual or who fall outside trial populations. Rigid adherence trains physicians to stop thinking at the edges, which is exactly where diagnostic errors happen.
Patients can counter a doctor's cognitive shortcuts by asking: What else could this be? Is there anything that doesn't fit? Could more than one thing be going on? The questions make the physician go back through the differential diagnosis and check for anchoring and premature closure.