After meals, you want to defecate, and bad breath may be related to indigestion, intestinal flora imbalance, gastrointestinal dysfunction and other reasons. 1. Indigestion: due to the slower peristalsis of the stomach and intestines, the secretion of digestive juices is reduced, food is not emptied in time, after abnormal fermentation can lead to bad breath, after eating can increase the pressure on the stomach, not fully digested food is discharged into the intestinal tract, stimulating the mucosa of the intestinal tract, which leads to the desire to defecate. 2. Intestinal flora imbalance: more harmful bacteria in the intestinal tract, increased gas production will appear bloating, manifested as bad breath, want to defecate after meals. 3. Gastrointestinal dysfunction: when the vegetative nerve innervating the gastrointestinal tract is impaired, it can cause uncoordinated gastrointestinal peristalsis, which affects the digestion of food, and therefore bad breath and wanting to defecate after meals occur. If the above symptoms occur, it is recommended to consult a doctor in a timely manner to identify the cause of the disease under the guidance of a professional physician and follow the doctor’s instructions for treatment.