There are three main reasons for farting a lot and smelling bad, including indigestion, intestinal flora imbalance and constipation. 1. indigestion: when eating too much meat, peas and other food, food accumulates in the intestines, the gastrointestinal tract has a heavy digestive burden, these substances are rich in high protein, in the intestinal fermentation and decomposition process is very easy to produce carbon dioxide, methane, hydrogen sulfide and other gases, resulting in farts and stinky phenomenon. 2. Intestinal flora imbalance: gastrointestinal bleeding, bacterial dysentery, ulcerative colitis, advanced malignant tumors and other diseases in the process, due to the role of bacteria, can also lead to farts and stinky phenomenon. 3. constipation: feces gather in the intestinal tract in large quantities, bacterial growth, catalyzing the production of large quantities of gas, leading to bloating and farts with a lot of odor. When the phenomenon of farting and smelly, it is recommended to take a light diet, maintain the stomach and intestines, can be relieved in the short term, if not improved, it is recommended to consult a doctor for treatment in a timely manner.