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Some doctors even think that the speed of bloodletting with a knife is not fast enough, because there is coagulation function in human blood, and bloodletting will solidify for a period of time. Through their continuous efforts, they finally found that sucking blood with leeches can solve the problem of blood coagulation. There are anticoagulant substances in leeches, and so do mosquitoes, but the amount of blood sucked is really too small.

With leeches, doctors can increase the amount of bleeding, which also leads to a sharp increase in the demand for leeches, so that many people make a living by breeding leeches.

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