In traditional Chinese medicine (TCM), meridians are invisible pathways or channels on the body. Our vital energy, or "chi," is thought to flow along these meridians, and anything that disrupts the smooth flow of chi is said to cause illness.
There are 12 regular meridians and 20 meridians in total in TCM. Each regular meridian is believed to correspond to an organ and run along the body to either the hand or the foot. Most acupuncture and acupressure points lie on a meridian.