The first part of the stool is mixed with yellow mucus, may be excess protein, or digestive diseases caused by intestinal mucosal inflammation exudation or with erosion and shedding, need to be analyzed specifically, not necessarily a disease. 1. Food factors: If you eat a lot of protein-rich food for a long time, resulting in indigestion, it may cause yellow mucus in the stool, this is a normal physiological phenomenon, not a disease, you can improve the symptoms by adjusting the diet structure. 2. Digestive system diseases: such as chronic pancreatitis caused by food indigestion, chronic colitis or infection caused by intestinal mucosal damage, inflammation and exudation, may cause mucus, accompanied by an increase in the number of times as well as the stool is not shaped. It is necessary to exclude the dietary habits caused by mucus in the stool, when necessary, go to the regular hospital as soon as possible to receive examination, under the guidance of specialists to receive standardized treatment.