A Person with a Kidney illness and fasting
Question :
I suffer from an illness in my kidney and the doctors have advised me not to fast. However, I do not obey what they say. Therefore, I fast but my pain increases. Is there any sin on me if I break my fast and what is the expiation of that?
Answer:
Whenever the fast becomes difficult for you, and it increases the illness, and a Muslim doctor who is known to be correct, advises you and informs you that the fast will harm your health and increase the pain and that you are endangering yourself, then it is allowed for you to break the fast. You must then feed a poor person for each day and you do not have to make up for the fasting due to your inability to do so. However, if it is decreed that the illness goes away, and you become well, and your health returns, then after that you must fast the next month (of Ramadhan) like others. You are not required to make up for the previous years during which you did not fast and you expiated for breaking the fast.
Source:
Ash-Shaykh Ibn Jibreen
Fatawa Islamiyah, Vol. 3 Pages 283-284