Question: I suffer from nosebleed, especially in hot weather, and sometimes during Istinshaq (sniffing water into the nose and then expelling it) for Wudoo’ (ablution), so I have to raise my head upwards and the blood goes into my stomach. Is this considered Haraam (prohibited)? Does the sacred Aayah (Qur’aanic verse): Forbidden to you (for food) are: Al-Maytah (the dead animals – cattle – beast not slaughtered), blood, the flesh of swine apply to me? Is my Sawm (Fast) valid?
Answer: The blood flowing down from your nose into your throat due to nosebleed or the like is involuntary; thus, there is no sin, but you should try to get rid of it through your mouth as much as you can... read more here.