What is the ruling on blood coming out of a fasting person?
Machine translationRead the Arabic original
The questioner : What is the ruling on blood coming out of a fasting person from his mouth or nose or the rest of his body?
The Shaykh : The coming out of that does not harm him, because it circulates within him. So if he had a nosebleed and a lot of blood came out of it, his fast is valid and there is no harm on him. Now, do not cause the blood to come out, such as by pulling out a tooth? There is no blame on him for that either, because he did not pull out his tooth to let the blood out; rather, he pulled out his tooth to relieve himself, so he only intends to remove this tooth. Moreover, the blood that comes out when a tooth is pulled is generally a small amount that does not amount to cupping.
The Shaykh : The coming out of that does not harm him, because it circulates within him. So if he had a nosebleed and a lot of blood came out of it, his fast is valid and there is no harm on him. Now, do not cause the blood to come out, such as by pulling out a tooth? There is no blame on him for that either, because he did not pull out his tooth to let the blood out; rather, he pulled out his tooth to relieve himself, so he only intends to remove this tooth. Moreover, the blood that comes out when a tooth is pulled is generally a small amount that does not amount to cupping.
Source
ابن العثيمين - فتاوى الصيام — archive.org (18:46)
The Arabic text is a machine transcription of the audio recording.