The World Federation One Stop Fiqh

Ruling 1619

If a fly enters a fasting person’s throat and goes down to such an extent that were he to then swallow it, it could not be called ‘eating’, it is not necessary for him to bring it out and his fast is valid. However, if the fly does not go down to that extent, he must bring it out even if this requires vomiting, unless vomiting is harmful or excessively difficult (mashaqqah) for him. And in the event that he does not vomit it but instead swallows it, his fast becomes invalid. Similarly, if he brings it out by vomiting, his fast also becomes invalid.