The Origin of the Term "Cancer": From Crab to Modern Oncology

Ancient Roots

The word cancer derives from the Latin cancer, meaning "crab." The Greek physician Hippocrates (c. 460–370 BC) used the term karkinos (crab) to describe tumors whose swollen veins resembled a crab's legs spreading from its body.

Historical Evolution

• 5th century BC: Hippocrates applies "karkinos" to malignant tumors.
• Roman era: Celsus translates to Latin "cancer."
• Middle Ages–Renaissance: Term persists in medical texts.
• Modern medicine: "Cancer" becomes the umbrella term for all malignant neoplasms—diseases of uncontrolled cell growth with potential to invade and metastasize.

Why the Crab Metaphor?

Hippocrates noted the hard, irregular mass of a tumor with vascular extensions radiating outward, much like a crab's claws and legs. The name stuck, reflecting both appearance and tenacity.