Leeches have been used in medicine for approximately how many years?

• A. 1000 years
• B. 1500 years
• C. 2500 years
• D. 3500 years

Answer: (C)

Leeches in medicine have ancient roots tied to early bloodletting traditions. Historical records show leech therapy in ancient Egypt and in the writings of Greek and Roman physicians, and the practice continued through medieval Europe into early modern medicine. When we estimate how long this has been used, the timeframe that best fits the historical evidence is about two and a half thousand years. That places the origin well before the first millennium and matches the longevity of its use across different cultures. The other time frames don’t align as closely with the documented beginnings of leech therapy, while pushing it much further back wouldn’t match the best-attested evidence.