Nausea and diarrhea may be caused by acute gastroenteritis, but other gastrointestinal diseases, such as gastrointestinal dysfunction due to various causes, cannot be ruled out. In addition, the diet is too cold may also appear this situation. Acute gastroenteritis, due to the action of bacteria, viruses and other pathogenic microorganisms and chemical substances, stimulates the intestinal wall, destroys the gastrointestinal mucosa and causes spasms and contractions of the intestinal smooth muscle, resulting in diarrhea and diarrhea and other symptoms. In addition, through a series of neurological reflexes, the body will produce various uncomfortable feelings such as nausea, vomiting, bloating, belching and headache. This condition is often caused by eating food or drinking water contaminated by bacteria or viruses. Patients who have been abusing antibiotics for a long time can also suffer from diarrhea and headache due to long-term irritation of the intestinal lining and dysbiosis of the intestinal flora. In addition, diseases in the stomach, such as stones and tumors, as well as adverse emotional stimuli, such as sudden tension and emotional anxiety, may induce the appearance of the symptoms. Cold in the abdomen can also put the smooth muscles of the stomach and intestines in a state of spasm, which can lead to diarrhea and vomiting. The causes of nausea and diarrhea are mainly acute gastroenteritis, which should also be combined with the patient’s systemic symptoms and treated with evidence.