Sometimes, the cause of diarrhea may not be only about food hygiene, but it may be caused by tourists’ physical unfamiliarity with the tastes of Thai or oriental food. Its ingredients are often pungent herbs and spices, which enhance flavors but can upset tourists’ stomach and cause diarrhea. Of course, they must be always aware of the hygiene of food and drink they have. Also wash the hands with soap and water before eating. Never drink tap water or eat uncooked food.