Galen wrote a guide to identify disease simulators

Galen is a Roman-era physician who wrote a monograph titled Quomodo morbum simulantes sint deprehendendi to unmask those feigning illness. He notably recounts the case of a patient simulating colic to dodge a public meeting and another feigning an injured knee to avoid a trip. His method consisted of identifying the patient's motive as well as observing discrepancies during the clinical examination.