Over 2000 patients with chronic headaches were observed in a study published in the journal Headache (2006; 46(4): 632-41). The subjects were divided into four groups. One group contained the subjects who had headaches that came and went. One group contained the subjects who had migraines. A third group consisted of patients with chronic tension headaches. The subjects in the fourth group had other kinds of chronic headache (cluster headaches, vascular headaches etc.). All of the groups received acupuncture treatments. Prior to treatment the subjects filled out questionnaires that determined the number of days with headaches, disability due to headaches and general quality of life. The questionnaires were also filled out six months after the beginning of the study. More than half of the subjects had the number of headaches decrease by 50% or better after receiving the acupuncture treatments.