MSK acupuncturist Jonathan Simon says that many studies have demonstrated the effectiveness of acupuncture in relieving pain, nausea, anxiety, insomnia, and other side effects of cancer treatment. In acupuncture, a certified practitioner inserts tiny needles through the skin at specific points that are thought to restore the flow of energy, or chi, and reduce symptoms. The insertion of the needles is painless, and they are typically left in place for 30 minutes. Acupuncture can be performed once or twice a week in the hospital or at an outpatient center for up to eight weeks at a stretch. Acupressure, in which pressure is applied to the same energy points, can be done at home to relieve side effects.