The causes of particularly smelly stools are excessive protein intake, constipation and indigestion. 1. Excessive protein intake: due to the consumption of a large number of fish, eggs and dairy products and other high-protein foods, part of the protein is digested and absorbed by the body, the other part of the intestinal flora decomposition, utilization, protein is decomposed by the bacteria, will produce sulfide and ammonia and other foul-smelling gases, along with the feces from the large intestine, so the stool particularly smelly. 2. Constipation: Consumption of rice cakes, sugar cakes and other indigestible food, resulting in gastrointestinal peristalsis slows down, the stool stays in the intestinal tract for a longer period of time, the intestinal tract will repeat the absorption of water in the stool, resulting in dry stools, causing constipation. And because the stool blocking the intestinal tract so that the gas can not be discharged smoothly, a variety of gas accumulation, with the discharge of stool, which leads to particularly smelly stool. 3. Indigestion: Due to the one-time intake of too much food or often eat late at night, resulting in the weakening of the gastrointestinal tract, so that the intake of food can not be digested in a timely manner, decomposition and absorption, the accumulation of the intestinal tract, through the fermentation of foul smell, so the stool is particularly smelly. Stool odor may also be caused by other reasons, the symptoms should be as soon as possible to the hospital to do the relevant treatment to clarify the cause of targeted treatment.