Bad breath may be caused by intestinal dysfunction, colon inflammation, Helicobacter pylori infection and other reasons. 1. Intestinal dysfunction: when the patient due to improper diet, such as long-term overeating, excessive spicy, greasy, stimulating food, may stimulate the intestinal tract, leading to intestinal dysfunction, resulting in patients with gastrointestinal flora imbalance, which in turn appeared in the stool is not shaped bad breath. 2. Inflammation of the colon: when there is inflammation in the intestinal tract, due to the stimulation of the release of inflammatory factors, it may cause the mucosa of the colon to become congested, swollen, mucus and so on. Due to the continuous exudation of inflammatory pus, it will lead to foul odor in the patient’s mouth, and at the same time cause the stool to be diluted by purulent substances and the phenomenon of unshaped stools. 3. Helicobacter pylori infection: After Helicobacter pylori infection, due to the constant invasion of bacteria to stimulate the gastrointestinal tract, it may cause gastritis, which may lead to bad breath, bitter mouth and other symptoms. At the same time, it may cause bacterial diarrhea, which may lead to unformed stools. To summarize, the causes of bad breath in unformed stools are different, and may also be caused by anxiety and depression. It is recommended to consult a doctor in a timely manner, under the guidance of the doctor to clarify the cause of the disease and targeted treatment, do not take medication, so as not to delay the condition.