Study on Treatment Mechanisms and Efficacy Prediction of Individualized Transcranial Magnetic Stimulation in Adults With Irritable Bowel Syndrome Using Multimodal MRI and High-Throughput Sequencing

Brief Summary

The goal of this clinical trial is to explore if "individualized repetitive Transcranial Magnetic Stimulation (TMS)" works to improve symptoms in adults with Irritable Bowel Syndrome (IBS). It also aims to learn how this treatment works (by looking at links between the brain, gut, and gut bacteria) and if tests like brain scans or gut bacteria checks can show if the treatment will work for a person. The main questions it aims to answer are: Will individualized TMS improve IBS symptoms (like stomach pain or discomfort) and affect the links between the brain, gut, and gut bacteria? Can brain scan results (from multimodal Magnetic Resonance Imaging, MRI) and gut bacteria checks (from high-throughput sequencing) predict how well a person responds to TMS? Participants will be adults aged 18-59 who: Meet the Rome Ⅳ criteria for IBS (a standard way to diagnose IBS); Have stopped taking IBS-related medicines for more than 2 weeks; Do NOT have MRI or TMS contraindications (like metal implants in the body, mental illness, pregnancy, or serious illnesses requiring hospital stays). Participants will: Receive 10 TMS sessions (5 times a week, for 2 weeks total) - TMS is a non-invasive treatment that uses gentle magnetic pulses on the scalp; Before the first TMS session, and again after the 10th session: Fill out surveys to rate IBS symptoms; Have an MRI scan (painless, takes about 60 minutes) to look at brain activity; Provide a small stool sample to check gut bacteria.