Leeches used for medical purposes

I saw this video on YouTube and while it might look gross, these leeches have an important role to play in the treatment of ailments like deep vein thrombosis and other ailments like varicose veins. Check out how the leech attacks the vein and clears it up. So, leches are not your enemy. If used the right way, they can help us tremendously, especially in the field of medicine.