Farting odor may be a sign of gastroenteritis, pancreatitis, gastrointestinal tumor, constipation, gastrointestinal dysfunction and other diseases. 1. Gastroenteritis: If the stomach and intestines are infected with bacteria and multiply, the fermentation of bacteria leads to fart odor. 2. Pancreatitis: When the pancreas is inflamed, fat cannot be broken down properly, resulting in smelly farts. 3. Gastrointestinal tumors: when the patient has gastrointestinal tumors, and the tumors are necrotic and ulcerated, it will produce a bad smell, which will lead to fart odor. 4. Constipation: Constipated patients will have less frequent bowel movements, difficulty in defecation, farting and stinking. 5. Gastrointestinal dysfunction: patients with gastrointestinal dysfunction may suffer from indigestion and other symptoms, and the abnormal digestion of food in the digestive tract may result in farting odor. If the fart is particularly foul-smelling and not relieved for a long time, or accompanied by other physical discomfort, you should go to the hospital in a timely manner for examination and diagnosis, to clarify the cause of the disease and receive treatment.