The Seventh of the Things That Break the Fast: Cupping, with Evidence.

The Shaykh : The seventh is cupping. If a fasting person undergoes cupping and blood comes out of him, he breaks his fast. We do not need evidence for this; the evidence is the hadith of Shaddad ibn Aws (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: This is an athar-based evidence, not a theoretical one. By "athar-based," I mean that the report is established from the Prophet (peace and blessings be upon him). There is also a theoretical evidence, which is that the cupper weakens due to cupping, because a large amount of blood comes out of him. When a large amount of blood comes out, his body weakens, and fasting affects this body that has been weakened by the loss of much blood. For this reason, we say that it is not permissible for a person whose fasting is obligatory to undergo cupping. If the blood rises in him and he needs cupping, he should undergo cupping and break his fast, and he may eat and drink in order to restore strength to his body.