Herbal Modulation of the Gut–Brain Axis in IBS-D: A Case Report

Abstract

Irritable bowel syndrome with diarrhea (IBS-D) is a prevalent and complex psychosocial neuroimmune disorder, influenced by diet, lifestyle, stress, and microbial ecology. Conventional biomedical treatments often focus on individual symptoms, leading to limited long-term efficacy and significant side effects. In contrast, traditional East Asian Medicine (TEAM) offers a comprehensive, whole-systems approach, rooted in millennia of practice and pattern differentiation, addressing underlying constitutional imbalances and the intricate gut-brain axis. 

This paper presents a case report of a 32-year-old male with chronic IBS-D, exacerbated by stress and previous travel, whose symptoms persisted despite conventional interventions. Diagnosis, based on traditional East Asian medicine (TEAM) principles, identified Liver qi stagnation and Spleen deficiency as the primary patterns. Herbal treatment involved a modified prescription of the formula Tong Xie Yao Fang (TXYF), known for its multi-target mechanisms, including gut-brain axis regulation, microbiota restoration, anti-inflammatory action, and gut barrier repair. Following two weeks of treatment, the patient experienced complete resolution of abdominal pain and loose stools, demonstrating the efficacy of the modified TXYF combination. This case highlights TEAM's potential for effective, integrated care of complex functional gastrointestinal disorders, bridging ancient wisdom with modern biomedical understanding.