Reheated rice syndrome, or fried rice syndrome, is a type of food poisoning that happens when you eat rice left out too long after cooking. TypesThe two main types of reheated rice syndrome are emetic (vomiting) and diarrheal. SymptomsCommon symptoms of reheated rice syndrome include:Abdominal crampsHeadacheNauseaVomitingWatery diarrheaThese symptoms tend to go away on their own within 24 hours. What Causes Reheated Rice Syndrome? Despite the name, reheated rice syndrome doesn’t begin when you reheat rice.