Alder Hey Study: 60 UK Kids as Young as 13 Treated for Ketamine Bladder Damage, Two-Thirds Are Girls

Since Alder Hey Children's NHS Foundation Trust opened the UK's first dedicated pediatric ketamine bladder clinic in May 2025, doctors there have logged more than 100 referrals, according to the BBC. A peer-reviewed analysis of the clinic's first 60 patients, published in the journal Archives of Disease in Childhood and covered by the Guardian, upday, and Central Fife Times, now puts hard numbers on how bad the damage gets and who it's hitting hardest.

The average patient was 14 years old. Ages ranged from 13 to 15, and some kids started using ketamine at 12 or younger, according to the BBC. About two-thirds of the 60 patients were girls, 43 out of 60 specifically, and roughly the same share lived in England's most deprived areas.

The condition is called ketamine-induced uropathy, or ketamine bladder. It happens because ketamine and its breakdown products sit in the bladder for long stretches, damaging the lining and muscle underneath. Harriet Corbett, a consultant pediatric urologist at Alder Hey, told the Guardian the damage "can affect the bladder wall, causing ulceration and fibrosis, and the effects can be irreversible."

Symptoms include frequent urination, blood in the urine, and incontinence. Some kids describe "peeing a jellyfish," which is the bladder's protective lining shedding, according to the BBC. Others get what patients call "K cramps," severe abdominal spasms. Professor Rachel Isba, who runs the clinic, told the BBC some patients describe the pain as "weeing over broken glass."

Ketamine is itself a powerful anesthetic and painkiller. Isba said some kids use more of the drug to numb the very bladder pain it's causing, a cycle she calls a "K loop." In the most severe cases documented, patients needed bladder surgery, bladder removal, or kidney dialysis.

Trauma and deprivation, not just drug use

Of the 60 patients, 72% had experienced emotional trauma during childhood, 16 had autism or ADHD or both, and one in five had experience with the UK care system, according to the Guardian and Central Fife Times. Half the patients reported using other drugs alongside ketamine. Nearly half used vapes, and more than a quarter drank alcohol, per the same analysis. Kids had typically been using ketamine for one to two years before anyone referred them to the clinic.

Isba told the BBC the drug is cheap, "pocket-money level," and that some kids use it to "shush" or quiet a traumatized brain. Peer pressure at school makes quitting harder, she said, especially for kids who've already been pushed out of mainstream education.

The scale of the rise is stark. Alder Hey saw one ketamine bladder patient in 2023, nine in 2024, then what doctors called "a rapid escalation" in 2025 that forced them to open a standalone clinic, according to the BBC. They now get roughly one referral a week from GPs and emergency rooms across Cheshire, Merseyside, and nearby regions.

Sample size and caveats

A reasonable skeptic could point out that 60 patients is a small, self-selected sample: kids who already had symptoms bad enough to get referred. That doesn't tell you how many kids nationwide are using ketamine without visible bladder damage yet, or whether the trauma and deprivation link is causal or just reflects who ends up in the NHS system in the first place. The researchers themselves frame this as a first-year snapshot meant to guide prevention, not a definitive national picture.

Bladder and urinary tract problems aren't exclusive to drug-damaged teenagers, either. An estimated 50 million Americans deal with nocturia, waking repeatedly at night to urinate, according to the Epoch Times, though that condition stems mostly from aging, hormonal shifts, and prostate issues, not drug toxicity, and only about 1.5 million ever seek treatment. The mechanisms are unrelated, but both stories point to a broader pattern: bladder damage is often silent until it isn't, and by the time patients show up for care, the problem has usually been building for years.

Corbett's message to parents and GPs is blunt. "This problem is preventable," she told the Guardian. Alder Hey and Lancaster University researchers say the next step is using this data to flag at-risk kids, particularly those with trauma histories or ADHD diagnoses, before ketamine use starts, not after a teenager is already peeing blood and cycling through pain meds to manage damage the drug itself caused. No UK government funding announcement or national screening program has been confirmed yet in connection with the findings.