Diarrhea and nausea may be related to acute gastroenteritis, bacterial dysentery and so on. 1. Acute gastroenteritis: due to the gastrointestinal mucosa is stimulated by inflammation, can lead to gastrointestinal hyperperistalsis, and gastrointestinal pressure will increase, resulting in diarrhea, nausea symptoms. 2. Bacterial dysentery: acute attack of bacterial dysentery can be manifested as severe abdominal pain, diarrhea, accompanied by nausea, vomiting and other symptoms. There are many other causes of diarrhea, nausea, it is recommended that patients with these symptoms go to the hospital in a timely manner, under the guidance of a professional doctor to determine the cause of the disease, and standardized treatment, so as not to delay the condition.