Is a leech bite painful ?

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https://www.tgh.org/institutes-and-services/treatments/leech-therapy#:~:text=What%20to%20Expect,contains%20a%20natural%20local%20anesthetic.

Leech therapy is typically not painful, as leech saliva also contains a natural local anesthetic. They will feed for a period of 15 minutes to an hour before falling off, and new leeches will be attached periodically over the course of several days until their assistance is no longer needed for proper circulation. 

There is a risk of infection associated with leech therapy, as the creatures use gut bacteria to digest blood, so many patients are given antibiotics to help prevent infection from developing.