If a fasting person vomits involuntarily during the daytime in Ramadan, should they make up for that day?
Involuntary vomiting does not invalidate Sawm (Fast); consequently, experiencing it while fasting does not require that the day be made up because the Prophet (peace be upon him) said:
Whoever vomits involuntarily is not required to make up the fast, but whoever vomits deliberately, must make up the missed fast.
(Related by Imam
Ahmad and the Compilers of the Sunan [Abu Dawud, Al-Tirmidhy, Al-Nasa’y and Ibn Majah]
through an authentic Isnad [chain of narrators])