Hadith 26175

Yahya said that he heard Malik say, "What I have heard from thepeople of knowledge is that if a man succumbs to an illness whichmakes fasting very difficult for him and exhausts him and wears himout, he can break his fast. This is the same as with a sick man in theprayer, who finds standing to be too difficult and exhausting, (andAllah knows better than the slave that it is an excuse for him andthat it really cannot be described). If the man is in such acondition he prays sitting, and the deen of Allah is ease.Allah has permitted a traveller to break the fast when travelling, andhe has more strength for fasting than a sick man. Allah, the Exalted,says in His book, 'Whoever among you is ill or on a journey (mustfast) a number of other days,' and Allah has thus permitted atraveller to break his fast when on a journey, and he is more capableof fasting than a sick man.