A polyp is a small, abnormal growth that forms on the inside lining of the body, usually in places like the colon, stomach, nose, or throat. Think of it like a tiny bump or mushroom-shaped lump growing where it shouldn't be. Most polyps are harmless, but doctors like to find and remove them because some types can eventually turn into something more serious if left alone for years.

Doctors often discover polyps during routine checkups. For example, if someone has trouble breathing through their nose, a doctor might find nasal polyps blocking the airway. During a colonoscopy (a medical exam of the large intestine), doctors can spot and remove colon polyps right away. This is why regular checkups matter: catching polyps early means they can be removed before they cause problems.

The word also has a completely different meaning in biology. A polyp is a simple water animal with a tube-shaped body and tentacles, like a sea anemone or the individual creatures that build coral reefs. These ocean polyps attach themselves to rocks or the sea floor and catch tiny food particles drifting by. The medical term borrowed this name because the growths looked similar to these small sea creatures.