Deliberate removal of blood for a therapeutic purpose. Historical practices include venesection, wet cupping and medicinal leeches; their historical rationale must be separated from present-day indications for venesection.
A leech used in medicine, historically to remove blood locally. The category is functional and does not identify one particular species.
Use of suction cups on incised skin to remove blood. Celsus describes bronze and horn cups and distinguishes this from dry cupping. [ref]
Removal of blood through a vein. The term can describe a historical intervention or a current treatment for a specific condition; the procedure alone does not establish its indication.
Venesection at the elbow. The ancient instruction to open a hollow vein here does not mean opening the vena cava.

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