"This is also the case for reducing the number of migraine attacks by at least 50% a month, an outcome considered useful by patients, and one known to improve quality of life. Success rates were about 2 in 10 with doing nothing (waiting list), 4 in 10 with fake acupuncture, 4-6 in 10 with real acupuncture, and 5 in 10 with drugs. Acupuncture as practiced by an authentic method is possibly helpful, but to only about 1 in 10 people more than fake acupuncture."
Pain is a notoriously good responder to suggestion.