Most kidney stone pain can be managed at home with the right combination of anti-inflammatory medication, heat, and hydration. The pain, called renal colic, happens when a stone moves into the narrow tube (ureter) connecting your kidney to your bladder, causing it to spasm and swell. Relief comes from reducing that inflammation and helping the stone pass as quickly as possible.
Why Kidney Stones Hurt So Much
The pain isn’t from the stone cutting you. It’s from pressure building up behind the stone as urine backs up into the kidney, combined with intense spasms in the ureter wall. This is why the pain comes in waves: the ureter contracts, trying to push the stone downward, then relaxes briefly before squeezing again. Understanding this matters because it tells you exactly what to target. You need to reduce the swelling, calm the spasms, and keep things moving.
Anti-Inflammatory Medication Is Your Best Tool
NSAIDs like ibuprofen and naproxen are the single most effective first step. They don’t just mask pain. They reduce the inflammation in the ureter wall that’s causing the pressure buildup, which addresses the root of the problem. A systematic review and meta-analysis published in Frontiers in Pharmacology confirmed that NSAIDs perform as well as or better than opioids for acute renal colic, with fewer side effects like nausea and vomiting.
Take ibuprofen or naproxen at the full over-the-counter dose as directed on the package, and keep dosing on schedule rather than waiting for the pain to return. Staying ahead of the inflammation cycle is more effective than chasing pain after it peaks. If you can’t take NSAIDs due to stomach issues or kidney concerns, acetaminophen is an alternative, though it won’t reduce the ureter inflammation the way NSAIDs do.
Apply Heat to Your Back or Side
A heating pad or adhesive heat patch placed over the affected side provides real, measurable relief. In a randomized controlled trial, patients using a heat patch saw significant pain score reductions at 15, 30, 45, and 60 minutes. Only 11.5% of people in the heat patch group needed additional rescue medication, compared to 31.4% in the control group. That’s a meaningful difference from something you can do at home right now.
Place the heat source on your flank (the side of your back between your ribs and hip) on whichever side hurts. Keep it there for up to an hour at a time. The warmth relaxes the smooth muscle in the ureter and improves local blood flow, both of which help ease spasms.
Hydration Helps, but Don’t Overdo It
Drinking plenty of water helps push the stone through, but flooding your system during an acute pain episode can actually increase pressure behind the stone and make things worse. Aim for steady, consistent fluid intake spread throughout the day rather than gulping large volumes at once. The European Association of Urology recommends 2.5 to 3 liters of fluid per day for stone patients, distributed evenly over 24 hours so your kidneys produce a consistent flow rather than sudden surges.
Water is ideal. If you’re sweating heavily or dealing with nausea and vomiting, you may need to replace electrolytes as well. Spread your intake across the whole day, including the evening, since urine can become more concentrated overnight.
Light Movement Can Help the Stone Along
Staying in bed feels instinctive, but gentle physical activity may actually promote stone passage. Walking and light jogging create subtle vibrations and shifts in body position that can help move a stone through the ureter. You don’t need to push through intense exercise. A 20-minute walk, some gentle yoga, or light movement around the house is enough. If the pain is too severe to move comfortably, rest until your medication kicks in and try again later.
Medications That Help You Pass the Stone Faster
For stones between about 5 and 10 millimeters, your doctor may prescribe an alpha-blocker. These medications work by relaxing the smooth muscle lining the ureter, essentially widening the tube so the stone can slip through more easily. A systematic review and meta-analysis found that alpha-blockers significantly improved passage rates for stones larger than 6 mm, boosting success from about 45% to 52%. For smaller stones under 6 mm, the benefit was minimal because those stones already pass at high rates on their own.
These medications are prescription-only, so you’ll need to see a doctor. They’re typically taken for a few weeks while you wait for the stone to pass.
How Long the Pain Lasts Depends on Stone Size
Smaller stones pass faster and more reliably. A study in European Radiology tracked passage rates across different stone widths over both short-term (about four weeks) and long-term (20 weeks) follow-up periods:
- Under 2.5 mm: 98% pass on their own, often within days
- 2.5 to 3.4 mm: 92% pass within a month, 98% by 20 weeks
- 3.5 to 4.4 mm: 71% pass within a month, 81% by 20 weeks
- 4.5 to 5.4 mm: 47% pass within a month, 65% by 20 weeks
- 5.5 to 6.4 mm: 21% pass within a month, 33% by 20 weeks
- 6.5 mm or larger: unlikely to pass without a procedure
The pain isn’t constant for the entire passage time. You’ll likely have intense episodes lasting minutes to hours, followed by periods of little or no pain as the stone sits still, then another wave when it moves again. Each time the stone shifts lower toward the bladder, the character of the pain changes. It often starts as deep flank pain, then migrates toward the lower abdomen and groin as the stone descends. Once it reaches the bladder, the worst is over. Passing it from the bladder outward is usually painless or mildly uncomfortable.
Pain After a Procedure
If your stone requires a procedure to remove it, you may have a temporary stent placed in your ureter afterward. Stent discomfort is a different kind of pain: a persistent urge to urinate, bladder pressure, and sharp stinging during urination. It can be surprisingly uncomfortable, sometimes rivaling the stone itself.
Alpha-blockers taken after the procedure have been shown to reduce stent-related pain and the need for additional painkillers. A 2023 meta-analysis found that the combination of an alpha-blocker with an anticholinergic (a medication that calms bladder spasms) was the most effective regimen for post-procedure pain control. Your urologist will typically prescribe something along these lines if a stent is placed. Stents are usually removed within one to two weeks.
Signs You Need Emergency Care
Most kidney stones pass safely at home, but certain symptoms signal a situation that can become dangerous quickly. Fever or chills combined with stone pain suggest a urinary tract infection behind the obstruction. This is a true emergency because infected urine trapped behind a stone can lead to a kidney infection that spreads to the bloodstream within hours.
Other red flags include vomiting so severe you can’t keep fluids or medications down, complete inability to urinate, or pain that doesn’t respond to any medication. Total or near-total ureteral obstruction can start damaging kidney function within two weeks, so persistent symptoms that aren’t improving deserve medical evaluation even if they don’t feel like an emergency. If you have only one functioning kidney, the threshold for seeking care should be even lower.