RESEARCHERS have reported that the age at which kidney stone disease first develops may provide important insight into a patient’s broader metabolic and cardiovascular health profile, according to a new observational cohort study involving more than 500 patients with nephrolithiasis.
The study analysed 546 patients with confirmed kidney stone disease and explored factors associated with early versus late symptom onset. Participants were divided into early-onset disease, defined as occurring before 45 years of age, and late-onset disease, occurring at 45 years or older.
Early-onset nephrolithiasis accounted for 57.1% of cases and was strongly associated with multiple metabolic and cardiovascular comorbidities. Investigators found that patients who developed kidney stones earlier in life were significantly more likely to have hypertension, diabetes mellitus, cardiovascular disease, renal impairment, gout, and gallstones.
The findings add to growing evidence that nephrolithiasis may represent more than an isolated urological disorder and instead reflect an underlying systemic metabolic process.
Higher BMI and Smoking Linked to Younger Onset Age
Researchers identified several sociodemographic and lifestyle factors associated with earlier disease onset, including higher body mass index, smoking status, employment, education level, and functional status. Statistical analyses demonstrated that many comorbid conditions remained independently associated with younger age of onset even after adjustment for other variables.
Regression modelling showed significant inverse associations between age of onset and hypertension, diabetes, heart disease, renal impairment, gout, and gallstones, suggesting that individuals developing stones at younger ages may carry a greater long-term metabolic burden.
Laboratory findings also supported this relationship. Elevated serum urea and calcium levels were independently associated with earlier onset nephrolithiasis. By contrast, urinalysis findings showed relatively limited predictive value, with urinary crystals emerging as the only significant urinary parameter linked to onset age.
Age of Onset May Help Guide Preventive Interventions
The authors suggested that recognising early-onset kidney stone disease as a marker of systemic metabolic dysfunction could help clinicians identify high-risk patients earlier and implement preventive strategies before complications develop.
They also noted that kidney stone disease incidence continues to rise worldwide, increasing the importance of identifying patients at risk of recurrent disease and associated chronic conditions.
Although the observational design limits causal interpretation, the study highlights the potential value of incorporating age of onset into routine nephrolithiasis risk assessment. The researchers called for future longitudinal studies to clarify the biological mechanisms linking early stone formation with cardiometabolic disease and to determine whether targeted intervention strategies can improve long-term outcomes.
Reference
Alrabadi A et al. When Stones Begin: Age of Onset Reveals the Systemic Metabolic Nature of Nephrolithiasis. Res Rep Urol. 2026; DOI: 10.2147/RRU.S603165.
Featured image: staras on Adobe Stock
