Why are leeches used for medicinal purposes?

Leeches are used for medicinal purposes primarily due to their ability to secrete anticoagulants, such as hirudin, which prevent blood clotting and improve blood circulation. They are commonly employed in reconstructive surgery to promote the healing of tissues by reducing blood congestion and enhancing blood flow to grafts and flaps. Additionally, leech therapy can help alleviate pain and reduce swelling in certain conditions. Their use in medicine highlights the potential benefits of natural therapies in modern healthcare.