Question: I suffer from renal failure and have undergone two surgical operations. Doctors advised me to drink no less than 2.5 liters of water daily. They also warned me that fasting and abstaining from drinking water for three consecutive hours endangers my life. Am I to follow their advice, or should I, seeking Allaah’s Support, observe Sawm despite their warning that there is an increased risk of developing a kidney stone? What should I do? What Kaffaarah (expiation) I am liable for if I do not observe Sawm (Fast)?
Answer: If your health condition is as mentioned, diagnosed as such by efficient and skillful doctors, you are allowed to refrain from observing Sawm to protect your health and prevent further complications. If in the future your health improves and you recover your ability to fast, without difficulty, you have to make up for those missed days of Sawm. However, if your disease continues and physicians decide that you are incurably susceptible to the risk of developing stones if you do not drink a sufficient quantity of water, you should feed a poor person for each day you do not fast… read more here.