The systematic review included 31 studies with 3234 patients. They found that acupuncture significantly reduced the number of stools per week, improved patients’ overall symptoms, improved the total effective rate, decreased the recurrence rate, and reduced pain levels for patients.

Acupuncture for Adults with Diarrhea-Predominant Irritable Bowel Syndrome or Functional Diarrhea: A Systematic Review and Meta-Analysis. Neural Plast. 2020 Nov 22;2020:8892184.