Intentional eating and drinking, intentional vomiting, sexual intimacy between a married couple and vitamin injections, all these break a Muslim's fast and are never debatable between the four [Islamic] schools of thought, said Dr Mashael.

Can you break your fast if you throw up?

If a person feels like vomiting, the fast still continues. However, if a person observing the fast chooses to vomit for any reason, his fast is considered as invalid. If one has sexual intercourse while he is observing his fast, he must perform kaffaarah, which means he must expiate the sin.

Is it normal to throw up when fasting?

Yes. Not eating can make you feel nauseous. This may be caused by a buildup of stomach acid or stomach contractions caused by hunger pangs. Learn more about why an empty stomach can trigger nausea and what you can do to quell hunger-related nausea.