A month of greasy stools may be pancreatic cancer, or it may be caused by enteritis, gastrointestinal dysfunction and other reasons. 1. Pancreatic cancer: it is a malignant tumor of the pancreas caused by smoking, heavy drinking, high-fat and high-protein diet, and the main clinical manifestations include abdominal pain, dyspepsia, jaundice, emaciation, greasy stools and other symptoms. 2. Enteritis: it is due to bacterial, viral, fungal, parasitic and other pathogens infection leading to intestinal inflammatory reaction, clinical manifestations mainly include fever, nausea, vomiting, abdominal pain, diarrhea, loose watery stools or mucus-pus-blood stools and other symptoms, which also lead to greasy stools. 3. Intestinal and gastrointestinal dysfunction: gastrointestinal neurosis due to irregular diet, mental factors, pathological factors, etc., manifested as acid reflux, belching, anorexia, nausea, vomiting, greasy stools and other symptoms. A month of greasy stools may also be seen in the biliary tract obstruction, functional dyspepsia and other diseases, the patient needs timely medical treatment.