What actually breaks the fast?
Three things, by agreement: eating, drinking, and sexual intercourse — done deliberately, during daylight hours. Vomiting on purpose and menstruation also end the fast. Beyond those, a great deal of what people worry about does not break it, and the narrower modern questions are genuinely disputed rather than settled.
The four schools concur on this.
The boundary is set in the verse that also sets the daily window: “It has been made permissible for you the night preceding fasting to go to your wives for sexual relations. They are a clothing for you and you are a clothing for them. Allah knows that you used to deceive yourselves, so He accepted your repentance and forgave you. So now, have relations with them and seek that which Allah has decreed for you i.e., offspring. And eat and drink until the white thread of dawn becomes distinct to you from the black thread of night. Then complete the fast until the night i.e., sunset. And do not have relations with them as long as you are staying for worship in the mosques. These are the limits set by Allah, so do not approach them. Thus does Allah make clear His verses i.e., ordinances to the people that they may become righteous.” (Qur’an 2:187)
What breaks the fast, without dispute:
1. Eating or drinking deliberately. 2. Sexual intercourse during the fasting hours — the most serious of them, carrying an expiation beyond making the day up. 3. Deliberately making yourself vomit. 4. The onset of menstruation or post-natal bleeding, at any point in the day.
What does not break it, and worries people needlessly:
- Eating or drinking by genuine mistake. If you forget you are fasting, you finish the fast and it counts — the Prophet ﷺ said what was eaten was provision Allah gave you (Sahih al-Bukhari 1933).
- Swallowing your own saliva, tasting food on your tongue while cooking without swallowing, or rinsing your mouth.
- Brushing your teeth, showering, or swimming.
- Being in a state of janāba at dawn; you wash afterwards and the fast is valid.
- Involuntary vomiting.
- Bad thoughts you did not act on.
The modern questions — injections, inhalers, eye drops, blood tests, patches — are exactly where scholars differ, because the four schools were never asked about them. Different bodies of scholarship have reached different conclusions, and someone who wants certainty on one of these should ask a scholar who follows their school rather than take a general answer from an app.
The practical rule for a beginner: if you did not intend it and it was not food, drink or intimacy, your fast is almost certainly fine.
- Qur’anQur’an 2:187