Kidney pain typically strikes in the back or side, just below the ribs, and the fastest way to get relief at home is a combination of heat, hydration, and the right pain reliever. But the approach that works best depends on what’s causing the pain, whether that’s a kidney stone, an infection, or something else entirely. Here’s what actually helps and what to avoid.
Identify What’s Causing the Pain
Kidney stones and kidney infections are the two most common culprits behind kidney pain, and they feel noticeably different. Stones cause sharp, severe pain that often radiates from the side and back down to the lower abdomen or groin. The pain tends to come in waves and can shift location as the stone moves through the urinary tract. A kidney infection, on the other hand, produces a more persistent, steady ache in the back or side, and it’s almost always accompanied by fever, chills, or pain during urination.
This distinction matters because the relief strategies overlap but aren’t identical. Infections require antibiotics. Stones may pass on their own with supportive care. Both benefit from the comfort measures below, but knowing which one you’re dealing with helps you decide how urgently you need medical attention.
Use Heat to Ease the Pain
A heating pad placed against your back or side, over the area where the pain is worst, can significantly reduce discomfort. Heat relaxes the smooth muscle in and around the urinary tract, which is especially helpful during the cramping waves of kidney stone pain. Apply it for 15 to 20 minutes at a time with a layer of fabric between the pad and your skin to prevent burns.
One thing to watch for: some over-the-counter pain relief patches contain anti-inflammatory medications that absorb through the skin. These can carry the same risks as taking those drugs orally, so check the ingredients before using topical patches alongside a heating pad.
Stay Well Hydrated
Drinking plenty of water helps in two ways. It dilutes the substances in urine that form stones, and it keeps urine flowing, which helps push a small stone through the ureter and out of the body. For kidney stone prevention and passage, the NHS recommends drinking up to 3 liters (about 13 cups) of fluid per day. During an active episode, steady sipping throughout the day is more effective than drinking large amounts at once.
Water is the best choice. Avoid sugary drinks and limit caffeine and alcohol, which can contribute to dehydration. If you’re vomiting and can’t keep fluids down, that’s a sign you need medical help, since dehydration will make things worse.
Choose the Right Pain Reliever
Acetaminophen (Tylenol) is generally safe for kidney pain and is the go-to option for people with any degree of kidney disease. Common anti-inflammatory drugs like ibuprofen and naproxen reduce blood flow to the kidneys, which can cause acute kidney injury or worsen existing kidney problems, particularly at higher doses or with repeated use. People with kidney function below normal levels should avoid these drugs entirely. The same goes for anyone with heart disease, heart failure, high blood pressure, or liver disease.
If you don’t have kidney disease and your pain is from a kidney stone, a short course of an anti-inflammatory can be effective for the intense, cramping pain. But if there’s any uncertainty about your kidney health, acetaminophen is the safer choice.
Prescription Options for Kidney Stones
If you’re passing a kidney stone, your doctor may prescribe a type of medication that relaxes the muscles of the ureter, the tube connecting the kidney to the bladder. These drugs make it easier for the stone to pass and can meaningfully reduce how long the process takes. A large review of clinical trials found that patients taking these medications passed their stones nearly four days sooner on average, experienced fewer pain episodes, and were significantly less likely to need surgery or hospitalization.
The benefit is most pronounced for larger stones. For stones 5 millimeters or bigger, patients on these medications had a 57% higher chance of passing the stone without surgical intervention compared to those who didn’t take them. For very small stones, the benefit was minimal since those tend to pass on their own regardless.
Adjust Your Position
There’s no single proven “best” position for kidney pain, but many people find relief lying on the side opposite the pain. If your left kidney hurts, try lying on your right side, and vice versa. This may reduce pressure on the affected area. Propping a pillow between your knees can also take strain off your lower back. Experiment with different positions until you find what feels most comfortable, since the ideal angle varies from person to person.
Gentle movement can sometimes help as well. Walking may encourage a kidney stone to shift and progress through the ureter, though this isn’t helpful during the most intense waves of pain.
Dietary Changes That Help
If your kidney pain is related to calcium oxalate stones, the most common type, certain foods can make things worse by increasing oxalate levels in your urine. The main ones to limit or avoid include spinach, nuts and nut products, peanuts, rhubarb, and wheat bran. These are all high in oxalate, a compound that binds with calcium in the kidneys to form stones.
Reducing sodium intake also helps, since excess salt increases the amount of calcium your kidneys filter, raising stone risk. Surprisingly, you should not cut back on dietary calcium. Getting enough calcium from food (not supplements) actually helps, because calcium binds oxalate in the digestive tract before it ever reaches the kidneys. Cutting calcium intake can paradoxically increase stone formation.
Signs You Need Emergency Care
Most kidney pain can be managed at home while you wait for a doctor’s appointment, but certain symptoms signal that you need immediate care. Go to the emergency room if you experience any of the following alongside your kidney pain:
- Pain you can’t control with over-the-counter medication
- Inability to urinate, which may indicate a complete blockage
- Fever or chills, suggesting an infection that could spread to the bloodstream
- Severe nausea or vomiting that prevents you from keeping fluids or medications down
- Blood in your urine
- A sudden, urgent need to urinate repeatedly that’s unusual for you
- Persistent fatigue or a general feeling of illness that won’t resolve
A kidney infection that goes untreated can become a serious, life-threatening condition quickly. And a stone that completely blocks the ureter can cause permanent kidney damage if the blockage isn’t relieved. Pain that is getting worse rather than better over several hours, especially with fever, warrants urgent evaluation.