Acupuncture is the placement of needles in skin or tissue to alleviate pain and to treat various physical and mental conditions. The placement of these needles have been mapped on the body centuries ago in a series of channels or meridians when used in ancient Chinese medicine. Many of these channels trace the paths of the body’s major nerve trunks. Each acupuncture point corresponds with specific body organs and systems when stimulated. A combination of points are often stimulated to take advantage of synergistic reactions between them. Acupuncture points can also be stimulated without the use of needles, using techniques known as acupressure, or by the application of heat, cold, water, laser, ultrasound, or other means at the discretion of the practitioner.