Is alcohol bad for your kidneys? A drink or two now and then, in someone with healthy kidneys, does not appear to do much harm. Heavy drinking does, and so does a single night of very heavy drinking. The line is lower than most people think, and it moves if your kidneys are already damaged.
I ask every new patient how much they drink. The honest answers are almost always higher than the first answer, which is fine. I am not counting to judge. I am counting because it changes blood pressure, gout, kidney stones, and how much of a given medication is safe.
What counts as moderate, and what counts as heavy
The National Institute on Alcohol Abuse and Alcoholism defines a standard drink as 12 ounces of regular beer, 5 ounces of wine, or 1.5 ounces of liquor. Moderate drinking is up to two a day for men and one a day for women. Heavy drinking is more than four a day or 14 a week for men, and more than three a day or seven a week for women.
A pint of craft IPA can be close to two standard drinks. So can a generous restaurant pour of wine.
How alcohol affects the kidneys
Blood pressure. Regular heavy drinking raises blood pressure, and high blood pressure is the second leading cause of kidney failure. Cutting back often brings readings down within weeks.
Dehydration. Alcohol blocks the hormone that tells your kidneys to hold onto water, which is why you urinate so much when drinking. Add heat, a hangover, vomiting, or a day of yard work, and the kidneys can be short on blood flow.
Binge drinking and sudden kidney injury. A very heavy night can injure the kidneys directly, especially when it comes with dehydration, vomiting, or lying in one position for hours, which can break down muscle and flood the kidneys with muscle protein. That is acute kidney injury, and it shows up in emergency rooms after holidays and big games.
The liver connection. Long-term heavy drinking damages the liver, and advanced liver disease can shut the kidneys down in a condition called hepatorenal syndrome.
Gout and uric acid. Beer raises uric acid more than wine or liquor. In a large study of men, beer was the drink most strongly tied to new gout. Our post on how long a gout attack lasts covers what to do if you already have it.
Does alcohol cause kidney disease?
Moderate drinking has not been shown to cause chronic kidney disease. Some studies even found light drinkers had slightly lower rates than non-drinkers, though that likely reflects other differences between the groups rather than a benefit from alcohol.
Heavy drinking is a different story. It drives the blood pressure, liver disease, and kidney injuries that lead to kidney disease over time. Smoking along with drinking makes it worse.
Is beer bad for your kidneys?
Beer is the one people ask about most, often because someone told them it helps pass kidney stones.
Beer does make you urinate more, and some observational studies found beer drinkers formed slightly fewer stones. But beer also raises uric acid, which causes a type of stone and gout, and it carries purines, phosphorus, and calories. I do not recommend drinking beer for stones. Water does the job without the downsides.
If you have chronic kidney disease
- An occasional drink is usually fine. Check with your doctor about your specific medications.
- Keep it to one drink a day or less, and not every day.
- Beer and wine carry some potassium and phosphorus. Liquor carries almost none, but mixers can.
- Avoid drinking alongside NSAIDs like ibuprofen. Both stress the kidney, and the combination after a night out is a common way people end up with acute kidney injury.
- If your kidney disease is advanced, ask before drinking at all. Some medications and some stages make it a bad idea.
Can you drink on dialysis?
Sometimes, in small amounts, with your dialysis team's blessing. Every drink is fluid you have to carry until the next session, beer carries potassium and phosphorus, and alcohol can interact with blood pressure and sleep medications. A small glass of wine or a spirit with a low-potassium mixer on a special occasion is a conversation worth having with your nephrologist and dietitian.
If you want to cut back
The kidney and blood pressure benefits of cutting back start quickly. If stopping feels hard, or you get shaky, sweaty, or anxious when you skip a day, tell your doctor before quitting suddenly. Withdrawal after heavy daily drinking can be dangerous and is worth doing with medical help.
Our chronic kidney disease and hypertension pages explain how we manage the conditions alcohol most affects.
Can alcohol cause kidney pain?
Some people notice an ache in the side or back after drinking. Usually that is dehydration, a kidney stone on the move, or a kidney infection, not alcohol damaging the kidney directly. Pain with fever, blood in the urine, or vomiting needs to be checked. Pain that only shows up after drinking and fades with fluids is worth mentioning at your next visit. Our post on back pain vs. kidney pain explains how to tell where it is coming from.
Getting care in Houston
Remix Medical is a physician-owned practice with nephrology offices in Montrose near the Texas Medical Center, East Houston, Katy, and Groesbeck, plus video visits anywhere in Texas. We ask about alcohol without judgment because it changes blood pressure, gout, and medication choices. Most plans are accepted, including Medicare, Medicare Advantage, and Texas Medicaid. Book an appointment or ask for a video visit.