A new study of acupuncture — the most rigorous and detailed analysis of the treatment to date — found that it can ease migraines and arthritis and other forms of chronic pain. The meta-analysis included studies that compared acupuncture with usual care, like over-the-counter pain relievers and other standard medicines. It also included studies that used sham acupuncture treatments, in which needles were inserted only superficially, for example, or in which patients in control