Can I fast if I have kidney disease?
It depends on your kidneys and your doctor's advice. Some people with mild, stable kidney disease can fast safely, but many with advanced kidney disease, dialysis or a recent transplant should not. If fasting would harm you, Islam excuses you, and you make up the days or pay fidyah instead.
Islam doesn't ask you to harm yourself
Allah made an exception for the sick in the verse on fasting itself:
The Prophet ﷺ said: "There should be no harm and no reciprocating harm" (Sunan Ibn Majah 2341, graded hasan). Scholars of all four schools agree that if a qualified doctor says fasting is likely to damage your health or slow your recovery, you shouldn't fast. Some say it can even become sinful to fast against clear medical advice.
Why fasting is risky for kidneys
Kidneys need water to clear waste. Long hours without fluid, especially in a long European or American summer day, can cause dehydration and a sudden drop in kidney function. Medicines like diuretics or blood pressure tablets can add to this. That's why doctors usually look at:
- Your stage of chronic kidney disease (CKD 1–5) and how stable it is.
- Dialysis: most people on dialysis are advised not to fast, though some doctors allow fasting on non-dialysis days. Scholars differ on whether a dialysis session itself breaks the fast. See Does an IV drip break my fast?
- A kidney transplant: often not advised in the first year, and only with your transplant team's approval later.
- Kidney stones: people prone to stones need lots of water, so fasting may raise the risk.
If you can't fast
- Temporary illness: make up the missed days later when you're well. See Do I have to make up missed Ramadan fasts?
- Long-term condition with no expected recovery: pay fidyah, feeding one needy person for each day missed, instead of making up.
- You still get the reward: the Prophet ﷺ said that when a servant falls ill, he is rewarded for the good he used to do when healthy (Sahih al-Bukhari 2996).
The same principles apply to other chronic conditions. See Do I have to fast during Ramadan if I have diabetes?
- Whether you can fast depends on your condition and doctor.
- Dialysis and recent transplants usually mean no fasting.
- If fasting may harm you, Islam excuses you.
- Make up the days later, or pay fidyah if the illness is permanent.
People also ask
How do I fast on very hot days?
To fast on very hot days, hydrate well at night, stay in the shade, slow down at midday and cool off with water. Break the fast if heat makes you ill.
Read the full answer →Can I fast after giving birth?
No fasting during postnatal bleeding (nifas). Once it stops you may fast, but breastfeeding or recovering mothers can delay and make up later.
Read the full answer →Do I need ghusl after a miscarriage?
Yes, usually: if human features had formed, bleeding after a miscarriage is nifas and needs ghusl. Early losses differ by school; Shafi'is say nifas.
Read the full answer →Does an enema break my fast?
Does an enema break your fast? The four schools say yes, while Ibn Taymiyyah and many modern scholars say no. Learn both views and practical options.
Read the full answer →Can I fast if I have cancer?
It depends: you can fast with cancer only if your doctor says it's safe. Illness excuses you; make up days later or pay fidya if you can't.
Read the full answer →