The causes of diarrhea and water (diarrhea) and nausea and vomiting are improper diet, abdominal cold, gastroenteritis and so on. 1. Improper diet: when patients eat unclean food, such as contaminated, uncleaned, rotten food, the pathogenic microorganisms will stimulate the gastrointestinal mucosa contraction, nausea and vomiting, diarrhea and diarrhea (diarrhea) symptoms. 2. Abdominal cold: when the patient’s abdominal mucosa is cold, it causes vasoconstriction, which will reduce the absorption of food in the gastrointestinal tract. The contraction of the gastric mucosa produces nausea and even vomiting of undigested food; as the food is not fully absorbed and contains more watery fluid, the symptoms of diarrhea and watery diarrhea will occur. 3. Gastroenteritis: when bacteria invade the gastrointestinal mucosa, it causes rapid degeneration of the gastrointestinal mucosa. Congested edema mucosa will become more fragile and sensitive, food stimulation of the gastric mucosa will make the stomach muscle contraction vomiting; edema of the intestinal mucosa so that the rapid flow of food patients will have diarrhea and water (diarrhea) symptoms. When the patient has diarrhea and water (diarrhea) and nausea and want to vomit symptoms, timely to the hospital under the guidance of a doctor to treat, to avoid causing electrolyte disorders, and even dehydration.