If you’ve ever passed a kidney stone, you probably would not wish it on your worst enemy, and you’ll do anything to avoid it again. “Kidney stones are more common in men than in women, and in about half of people who have had one, kidney stones strike again within 10 to 15 years without preventive measures,” says Dr. Brian Eisner, co-director of the Kidney Stone Program at Harvard-affiliated Massachusetts General Hospital.
Kidney stones develop when certain substances, such as calcium, oxalate, and uric acid, become concentrated enough to form crystals in your kidneys. The crystals grow larger into “stones.” About 80% to 85% of kidney stones are made of calcium. The rest are uric acid stones, which form in people with low urine pH levels.
After stones form in the kidneys, they can dislodge and pass down the ureter, blocking the flow of urine. The result is periods of severe pain, including flank pain (pain in one side of the body between the stomach and the back), sometimes with blood in the urine, nausea, and vomiting. As the stones pass down the ureter toward the bladder, they may cause frequent urination, bladder pressure, or pain in the groin.
“If you experience any of these symptoms, see your primary care physician,” says Dr. Eisner. “He or she will likely perform a urinalysis and a renal ultrasound, abdominal x-ray, or CT scan to confirm kidney stones are the source of your pain and determine their size and number.”
Stones typically take several weeks to a few months to pass, depending on the number of stones and their size. Over-the-counter pain medications, like ibuprofen (Advil, Motrin IB), acetaminophen (Tylenol), or naproxen (Aleve), can help you endure the discomfort until the stones pass. Your doctor also may prescribe an alpha blocker, which relaxes the muscles in your ureter and helps pass stones quicker and with less pain.
If the pain becomes too severe, or if they are too large to pass, they can be surgically removed with a procedure called a ureteroscopy. Here, a small endoscope (a device with a miniature video camera and tools at the end of a long tube) is passed into the bladder and up the ureter while you are under general anesthesia. A laser breaks up the stones, and then the fragments are removed.
Even though kidney stones can be common and recur once you’ve had them, there are simple ways to help prevent them. Here are some strategies that can help:
This article has been adapted from Harvard Health and accessible at https://www.health.harvard.edu/blog/5-things-can-help-take-pass-kidney-stones-2018030813363