UCLA and Cedars-Sinai Study Reveals Stark Racial and Gender Gaps in U.S. Irritable Bowel Syndrome Diagnoses

UCLA study finds Black patients and men are significantly less likely to receive a formal IBS diagnosis despite having similar symptoms to white patients.

By: AXL Media

Published: Apr 10, 2026, 3:59 AM EDT

Source: Information for this report was sourced from University of California - Los Angeles Health Sciences

Investigating the Prevalence of Undiagnosed Gastrointestinal Distress

Irritable bowel syndrome (IBS) is a chronic gut-brain interaction disorder affecting between 20 and 40 million Americans, characterized by abdominal pain, bloating, and irregular bowel habits. A new study published in Clinical Gastroenterology and Hepatology, led by UCLA Health and Cedars-Sinai Medical Center, analyzed data from the 2020 National Gastrointestinal Survey II to identify systemic barriers to care. Of the 88,600 respondents, more than 6% met the strict Rome IV clinical criteria for IBS, yet a significant majority had never received a formal diagnosis. This lack of clinical recognition often leads to repeated, unnecessary medical testing and prevents patients from accessing insurance coverage for specialized therapies.

Racial Inequities in Clinical Confirmation

One of the most concerning findings of the research was the measurable gap between white and Black patients regarding formal diagnosis rates. While 35% of white patients who met the symptomatic criteria received an IBS diagnosis, only 24.6% of Black patients were similarly diagnosed. This disparity persisted even when researchers accounted for socioeconomic status, symptom severity, and the type of healthcare provider visited. Furthermore, healthcare-seeking behavior was found to be statistically similar across all racial and ethnic groups, suggesting that the diagnostic gap is not a result of Black patients avoiding medical attention but rather an inequity in the clinical encounter itself.

Gender Differences and Healthcare Seeking Behavior

The study also highlighted a notable gender divide, with 36.5% of women receiving a diagnosis compared to just 26.2% of men. This gap may be partially attributed to the fact that women were more likely to report severe symptoms, such as bloating and constipation, and were more likely to seek medical help (73.3% versus 68.7%). However, senior author Dr. Lin Chang noted that the disparity might also be fueled by historical misconceptions that IBS is primarily a "woman’s condition," which may lead providers to overlook the disorder in male patients. This diagnostic lag could be contributing to an overestimation of the gender prevalence gap in current medical literature.