Why Sharks Rarely Get Cancer: The Truth Behind the Myth

 

For years, many people believed that sharks could never get cancer. This idea became so popular that some companies even sold shark cartilage supplements, claiming they could help prevent the disease.

But is it actually true?

The answer is no.

Scientists have discovered that sharks can develop cancer, just like many other animals. Tumors have been found in several shark species, proving they are not immune to the disease.

So where did the myth come from?

The belief started because cancer seemed to be reported less often in sharks than in humans or other animals. Since sharks have existed for over 400 million years, many assumed they had evolved a natural resistance.

While sharks aren’t cancer-proof, they do have remarkable immune systems and an impressive ability to heal from injuries. Researchers continue to study these adaptations to better understand wound healing and disease resistance.

Another fascinating fact is that sharks have survived five mass extinction events, outliving dinosaurs by more than 150 million years. Today, there are over 500 known species of sharks, ranging from the tiny dwarf lanternshark, which fits in your hand, to the enormous whale shark, the largest fish on Earth.

Despite their fearsome reputation, most sharks pose little danger to humans. In fact, humans kill millions of sharks every year through fishing and the fin trade, making many species vulnerable or endangered.

Sharks are extraordinary survivors, but they’re not invincible. Separating myths from scientific facts helps us better appreciate these ancient predators and understand why protecting them is so important for healthy oceans.