The stomach, one of the six fu-organs, is located in the middle energizer and can be divided into three parts, i.e., the upper, the middle, and the lower part of gastric cavity. The upper part includes the cardia connecting to the esophagus and the lower part the pylorus connecting to the small intestine, which provides the pathway for food and water into and out of the stomach. The stomach is indispensable to digesting and absorbing food and water. Its primary physiological functions involve receiving and decomposing the ingested food and drinks. The stomach and the spleen are both located in the middle energizer, pertaining to earth in the five elements. The stomach belongs to yang, namely yangming and dryness-earth, whereas the spleen pertains to yin, namely taiyin and dampness-earth. The Stomach Meridian of Foot-yangming is exterior-interiorly related to the Spleen Meridian of Foot-taiyin.