Origins of the term K disease in Vietnam

In Vietnam, the term “K disease” is commonly used as a synonym for cancer. While some suggest the letter K is an abbreviation based on the initial /k/ sound in the English word “cancer,” this explanation is technically inaccurate as the word begins with the letter C.

Historical and linguistic roots offer alternative explanations. The English term “cancer” derives from Latin, meaning crab, similar to the ancient Greek term “karkinos.” This name was inspired by the appearance of certain malignant tumors, which ancient physicians like Hippocrates noted resembled the legs and claws of a crab. Additionally, the German word for cancer, “Krebs,” also translates to crab, which may contribute to the association with the letter K.