What are the things that can break our fast?
The things that void your fasting scholars say are seven so memorize them.
First, eating and drinking, anything that goes into your stomach through the mouth or through the nose then this nullifies your fasting evenif you swallow a stone, it nullifies your fasting.
Secondly whatever takes the role of food and drink such as the IV that you can live for 3,4 days without eating and drinking just because of this IV is going into your veins so this nullifies your fasting and this means that if I take antibiotics if I take voltaren shots if I take insulin if I take penicillin anything that does not nourish me that does not take the role of eating and drinking this doesn't nullify your fasting.
Thirdly vomiting intentionally, I ate too much I have something going on I don't like it I put my finger or smell something and I vomit intentionally this voids my fasting if I ate too much and I feel disturbed and suddenly without me helping it I'm throwing up I'm vomiting this is unintentional it doesn't affect your fasting.
Fourthly cupping and this is an issue of dispute among scholars so the most authentic opinion it’s safer not to cup while fasting however taking samples of your blood for the hospital is totally permissible bleeding from your gum while the doctor the dentist is working this does not affect your fasting try not to swallow it. what else donating blood if it wears you down in a pint or two if in this case make it after Maghrib and if you don't have the possibility to make it after Maghrib then do it and make up for that day.
Fifthly ejaculation any person ejaculating while he's awake of course because this is different than nocturnal emission what they call wet dreams this doesn't affect your fasting at all but if you do it intentionally while awake by seeing at looking at something or thinking or masturbating this nullifies your fasting.
Sixth is intercourse and this is the highest of all.
Seventh is the blood of menses or postnatal bleeding these two if there exists then the fast is void even if it's seconds before the azaan
Via: Sheikh Assim Al Hakeem