The causes of old hot farts include physiological factors and pathological factors such as indigestion, intestinal flora disorders and peptic ulcers. 1. Physiological factors: too much air enters the stomach due to eating too fast, which leads to the accumulation of gas in the gastrointestinal tract, so there are always hot farts. 2. Indigestion: If various factors trigger indigestion, gas production increases, at this time, the phenomenon of hot farts will also occur. 3. Intestinal flora disorders: when the intestinal gas-producing bacteria suddenly increase, the intestinal tract will accumulate gas, thus causing hot farts. 4. Peptic ulcers: when patients have gastric ulcers and other diseases, these diseases will cause gastrointestinal peristalsis to weaken, and digestion and absorption functions are affected, so hot farts will also occur. If the phenomenon of hot farts can not be relieved, it is recommended to consult a doctor in time.