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As a result of an experiment directly guided from the gastric membrane side or gastric tunica serosa ventriculi side, electric activity of the stomach is generated at 3 cycle per minutes (3cpm) from the pacemaker near the greater curvature of stomach side in the stomach upper part 1/3, and its spread to the pylorus side is confirmed. This is called electrical control activity (ECA) or slow wave. However, in general clinical use, it is very difficult to record the electric activity from a gastric membrane side or gastric tunica serosa ventriculi, and the clinical application is restricted. On the other hand the method of recording electric activity of the stomach accompanied by stomach movement from the abdominal walls is called electrogastrography (EGG), and we can record it now comparatively easily because of the progress of technology in recent years. Thus, we performed EGG measurement under various situations (food, physical stress and mental stress loads). Consequently, we discovered whether stress has a certain influence on the stomach activities.