Quran Lessons
(27) If a person feels extreme hunger or thirst, and fears that he may die or that some of his faculties may be irreparably damaged, and has rational grounds for believing this to be so, he may break his fast and make up for it later on, because saving one's life is obligatory.
70 Matters Related to Fasting
Part 14
But it is not permissible to break one's fast because of bearable hardship or because one feels tired or is afraid of some imagined illness.
People who work in physically demanding jobs are not permitted to break their fast, and they must have the intention at night of fasting the following day. If they cannot stop working and they are afraid that some harm may befall them during the day, or they face some extreme hardship that causes them to break their fast, then they should eat only what is enough to help them bear the hardship, then they should refrain from eating until sunset, and they have to make the fast up later. Workers in physically demanding jobs, such as working with furnaces and smelting metals, should try to change their duties during fasting.
Students' exams are no excuse for breaking one's fast during Ramadaan, and it is not permissible to obey one's parents in breaking the fast because of having exams, because there is no obedience to any created being if it involves disobedience to the Creator. (Fataawa al-Lajnah al-Daa'imah, 10/241).
(28) The sick person who hopes to recover should wait until he gets better, then make up for the fasts he has missed; he is not allowed just to feed the poor. The person who is suffering from a chronic illness and has no hope of recovery and elderly people who are unable to fast should feed a poor person with half a saa' of the staple food of his country for every day that he has missed. (Half a saa' is roughly equivalent to one and a half
kilograms of rice). It is permissible for him to do this all at once, on one day at the end of the month, or to feed one poor person every day. He has to do this by giving actual food, because of the wording of the aayah - he cannot do it by giving money to the poor (Fataawa al-Lajnah al-Daa'imah, 10/198). But he can give money to a trustworthy person or charitable organization to buy food and distribute it to the poor on his behalf.