Your blood could reveal inflammatory bowel disease 10 years before diagnosis

A major study has uncovered hidden warning signs of inflammatory bowel disease in the blood up to 10 years before diagnosis. Researchers discovered distinct antibody patterns that could help predict who would later develop Crohn’s disease or ulcerative colitis, even distinguishing people at risk of more complicated disease. Scientists have identified hidden changes in the immune system that can appear up to 10 years before a person is diagnosed with inflammatory bowel disease (IBD). The findings, presented at UEG Week 2026, suggest that certain antibody patterns in the blood could eventually help doctors identify people at risk of developing the condition and even predict how severe their disease might become.

Inflammatory bowel disease refers to a group of long-term disorders, including Crohn's disease (CD) and ulcerative colitis (UC), that cause persistent inflammation in the digestive tract. These conditions develop when the immune system responds abnormally, contributing to inflammation and damage in the intestines. Scientists increasingly believe that IBD begins developing years before it is officially diagnosed. However, the immune system changes that take place during this early, largely hidden period have remained poorly understood. To investigate what happens before IBD is diagnosed, researchers examined 2,000 blood serum samples collected from 500 people. The participants included 200 who eventually developed Crohn's disease, 200