Electroacupuncture for Chronic Functional Constipation: Large-Scale Randomized Trial Shows Sustained Increase in Bowel Movement Frequency

Chronic functional constipation is one of the most prevalent gastrointestinal complaints in the medical office, affecting between 10% and 17% of adults worldwide, with predominance in women and older adults. Available pharmacologic treatments — osmotic laxatives, prokinetics, secretagogues, and 5-HT4 receptor agonists — offer partial relief, with high discontinuation rates due to adverse effects or loss of response. Amid this gap, electroacupuncture gained ground as a non-pharmacologic alternative after the publication of a large-scale multicenter trial in Annals of Internal Medicine(2022), considered one of the most robust studies in the area.

Results — Clinical Response and Sustainment

The proportion of patients who reached the primary outcome — three or more complete spontaneous bowel movements per week — was significantly higher in the electroacupuncture group compared with sham. More relevant for clinical practice: the benefit was maintained during the follow-up period, suggesting that the effect of treatment persists after the end of sessions. Patients in the intervention group also reported improvements in associated symptoms — evacuation straining, sensation of incomplete evacuation, and abdominal discomfort — with gains on quality-of-life scales specific to constipation.

Plausible Mechanisms

Translational studies suggest that electroacupuncture modulates colonic motility through multiple pathways: increase of sacral parasympathetic tone, modulation of myenteric plexuses via the vagovagal reflex, regulation of enteric neurotransmitters such as serotonin and nitric oxide, and changes in the intestinal microbiota. Animal models have demonstrated increased colonic propulsive contractions and accelerated transit after stimulation of points such asST25 and ST37 — points classically associated with the management of motility disorders in classical Chinese medicine semiology.

Clinical Implications

The findings support the inclusion of electroacupuncture as a second-line therapeutic option for patients with chronic functional constipation who do not respond to or do not tolerate conventional laxatives. For the medical acupuncturist, the investigated protocol offers a reproducible roadmap: defined points, consistent stimulation parameters (mixed frequency, low tolerable intensity), and standardized treatment duration. For the patient, the prospect of a therapy with an extremely low adverse-effect profile and lasting benefit is particularly attractive in a chronic condition with often unsatisfactory pharmacologic treatment.