There are many causes of acute gastroenteritis, including the following main reasons.1. Infection. Eating food that has been infected by bacteria or other toxins can easily cause acute gastroenteritis. Bacteria are mainly Staphylococcus aureus toxins, which can easily affect the stomach and intestines, leading to the emergence of the disease. 2, bad eating habits. Frequent overeating or overfilling and overfeeding can easily cause the emergence of acute gastroenteritis, because the stomach and intestines in the process of eating and drinking to lose elasticity, will not be able to deal with the food eaten, difficult to digest, resulting in gastroenteritis. 3, chemical stimulation. Frequent consumption of stimulating foods or drugs, drinking a lot of strong alcohol or strong tea, will stimulate the gastrointestinal mucosa, resulting in gastrointestinal mucosa congestion and edema, or even the emergence of erosion, resulting in acute gastroenteritis.