A study published in the Annals of Internal Medicine, has determined acupuncture, and more specifically, electroacupuncture is a safe and effective treatment for chronic severe functional constipation. The study was conducted throughout 15 hospitals in China. The participants were patients with chronic severe functional constipation and no underlying pathological causes for the constipation. They each received 28 sessions of acupuncture with electrical stimulation. The study showed each participant increased the number of consistent bowel movements with the assistance of electroacupuncture treatments and without any adverse side effects.