Does bleeding break my fast?

It depends on the kind of bleeding. Cuts, nosebleeds, bleeding gums and blood tests don't break your fast. Menstruation and bleeding after childbirth do: a woman stops fasting and makes those days up later. Giving a lot of blood is debated.
Everyday bleeding: your fast is fine
- Cuts and scrapes from cooking, sport or work.
- Nosebleeds. Lean forward and let the blood out; spit out any that reaches your mouth.
- Bleeding gums after brushing or flossing. Spit the blood out; tiny traces in your saliva are forgiven. See Does swallowing my spit break my fast?
- Small blood tests at the doctor or a finger-prick glucose check.
None of these is eating or drinking, and none was the reason fasting was prescribed, so scholars agree they don't affect the fast.
Periods and post-natal bleeding
A woman who is menstruating, or bleeding after giving birth (nifas), doesn't fast. If her period starts in the middle of a fasting day, even an hour before sunset, that day doesn't count and she makes it up later. Aisha said that during their periods "we were ordered to make up the fasts, but not the prayers" (Sahih Muslim 335). This is a mercy, not a punishment. See Do I have to pray while on my period?
Irregular bleeding outside the normal period (istihadah), such as spotting from contraception, doesn't stop the fast. A woman in that situation fasts and prays as normal. When your period ends, see When can I pray again after my period ends?
Blood donation and cupping (hijama)
Here scholars differ. The Prophet ﷺ was cupped while fasting (Sahih al-Bukhari 1938), and the Hanafi, Maliki and Shafi'i schools say losing blood this way doesn't break the fast. The Hanbali school relies on another hadith, "The one who cups and the one who is cupped have broken their fast" (Sunan Abi Dawud 2367), and holds that cupping does break it. Many scholars treat a full blood donation like cupping.
A gentle approach: donate blood or have hijama after iftar. If you must give blood during the day, the majority view says your fast is valid, but don't do it if it will leave you weak or dizzy.
Serious bleeding or injury
If you're badly hurt, need a drip or feel faint, break the fast and get medical help. Saving your health comes first, and you make the day up later. Always follow your doctor's advice.
- Cuts, nosebleeds, bleeding gums and small blood tests don't break the fast.
- Periods and post-natal bleeding end the fast; make up the days later.
- Cupping and blood donation: majority say fine, Hanbalis say it breaks.
- With serious injury, break the fast and get help.
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