How an infection theory became a surgical program
In the early 20th century, some doctors embraced the idea of “focal infection”: a small infection in one part of the body, such as an abscessed tooth or inflamed tonsil, might send harmful effects through the bloodstream and cause illness elsewhere. Henry Cotton applied this theory to psychiatric disorders. He reasoned that if infection was driving symptoms, removing the suspected source might restore a patient’s health.
That logic turned ordinary signs of infection into targets for increasingly extensive operations. After extracting teeth and removing tonsils, Cotton pursued other possible sources inside the body, including the colon. The approach offered a seemingly concrete explanation for illnesses that doctors understood poorly—and a treatment that appeared decisive.
Why the treatment could do so much harm
The theory did not establish that removing healthy or chronically inflamed tissue could cure mental illness. But the operations themselves carried immediate dangers: bleeding, infection, and complications from major surgery. Patients in psychiatric hospitals had little power to refuse treatment, making the consequences especially severe when the diagnosis and evidence were uncertain.
Cotton presented his work as successful, but the claimed benefits obscured the toll of the procedures. The episode shows how a plausible-sounding medical mechanism can become dangerous when a hypothesis is treated as proof: each unsuccessful operation can prompt doctors to search for another suspected source rather than reconsider the original idea. For patients, that search could mean losing more of their bodies without a dependable path to recovery.
