Fecal impurity is clinically known as incomplete bowel movement, the causes of this symptom are more, such as constipation, mental factors, hemorrhoids, inflammatory bowel disease and other factors related to the specific circumstances need to be combined with other medical history and other symptoms comprehensive judgment. 1. Inflammatory bowel disease: Inflammatory bowel disease can lead to different degrees of edema and erosion of the intestinal mucosa. When the stool comes into contact with the rectum, it will cause symptoms of rectal irritation, resulting in unclean stool or increased stool frequency. 2. Mental factors: the mental state will also affect the function of the digestive system, such as long-term overwork, anxiety, emotional tension, etc., will cause intestinal dysfunction, the stool is not clean. 3. constipation: constipation is mostly associated with poor defecation habits, dietary habits and gastrointestinal diseases, the main symptom is the number of bowel movements, defecation, defecation difficulties, fecal dryness, and so on, serious patients will also appear anal fissure, blood in the stool, and so on. 4. hemorrhoids: hemorrhoids are mostly due to bowel movement time is too long, constipation and other factors. When the hemorrhoids volume is too large, it will block the anus, this situation may be difficult for patients to defecate as well as the situation of the stool is not clean. In addition, the emergence of unclean stool may also be related to intestinal polyps or even tumor lesions, should be timely consultation, to clarify the specific causes of the disease, under the guidance of the doctor to give standardized treatment.