Plague, War, and the Scalpel: How Black Death Survivor and Surgeon Guy de Chauliac Defined Cancer

Yesterday, with Saint Hildegard von Bingen, we searched for cancer's insidious roots on the misty banks of the Rhine. Hildegard had sensed that disease began with a disruption of the body's internal chemistry. But by the 14th century, the darkness descending over Europe was so dense that mystical visions would give way to the cold reality of death.

The year was 1348. The epidemic that wiped out a third of Europe's population, the "Black Death" (plague), struck Avignon, and Pope Clement VI's chief physician, Guy de Chauliac, chose to stay behind, unlike those who fled in fear.

Having returned from the brink of death, Chauliac drew on that brutal experience to write, in 1363, the greatest surgical masterpiece of the Middle Ages, Chirurgia Magna (Great Surgery). This work was a historic declaration that surgery was not merely a craft but a branch of science.

An Acid Boiling in the Body: "Burnt" Bile and Cancer's Burning Nature

In explaining the cause of cancer, Guy de Chauliac added a new aggressiveness to the ancient Greek theory of "Black Bile". For him, cancer was not a simple buildup of fluid, but a catastrophe caused by black bile trapped in the body that had "burnt" (adust) and decayed.

According to Chauliac, these harmful fluids were drawn to an area (such as the breast), heated up there, and acquired a "poisonous, acidic quality". In his description, cancer consumed tissue from within like an acid burn boiling in the body's own juices.

Naming Nameless Monsters: The Wolf in the Legs and the Untouchable Face

Chauliac's greatest practical contribution to the history of oncology was his classification of lesions according to their anatomical locations and their ferocity:

The Sharpest Scalpel: The Courage of a Surgeon Who Knows When to Stop

Chauliac had a vital reason for calling facial cancers "Noli me tangere" (Do Not Touch Me!): he had confirmed through his own clinical experience the famous rule Hippocrates had laid down centuries earlier. If you operated incompletely on such a facial cancer, you would merely irritate it further and destroy the patient's face amid terrible pain.

Chauliac was skilled enough to know when to use his scalpel, yet honest enough to acknowledge his limits. If the tumor could not be removed radically, rather than needlessly killing the patient on the operating table, he insisted on palliative care with pain-relieving ointments. This was one of oncology's first systematic approaches focused on "quality of life".

Dark Secrets Beneath the Skin: Toward the Anatomical Revolution

Guy de Chauliac was a weary hero who tore through the dark shroud of the Middle Ages. He had reached the pinnacle of his era in reading disease from the outside. Yet he sensed that cancer's true secret lay "inside", in the depths of the organs.

To defeat disease, it was necessary to do something that had been forbidden for over a thousand years: look inside the human body, into those dark passages. Chauliac's yearning for anatomy heralded medicine's next great destination.