We would not allow a man who was fasting to get himself cupped due to abomination of hardship.
Sunan Abi Dawud Book 14, Hadith 63
← Previous Hadith A man from the Companions of the Prophet (ﷺ) told me that the Messenger of Allah (ﷺ) prohibited cupping and perpetual fasting, but he had not made them unlawful showing mercy on his Companions. Thereupon he was asked: Messenger of Allah, you observe perpetual fast till dawn. He replied: I observe perpetual fast till dawn (for) my Lord gives me food and drink.

Sunan Abi Dawud Book 14, Hadith 62 Next Hadith → The Messenger of Allah (ﷺ) said: Neither vomiting, nor emission, nor cupping breaks the fast of the one who is fasting.

Sunan Abi Dawud Book 14, Hadith 64