Dizziness, nausea and diarrhea are mainly caused by food poisoning, gastroenteritis, adverse drug reactions. 1. Food poisoning: mostly seen in eating contaminated meals. When the diet is unhygienic, it is easy to cause Salmonella and E. coli infections, which induces intestinal diseases, mainly characterized by abdominal pain, diarrhea, nausea, vomiting, headache, dizziness, and so on. 2. Gastroenteritis: the most common, caused by ingestion of unclean food infected with E. coli, rotavirus, norovirus, etc., with abdominal pain, diarrhea, nausea and vomiting, dehydration, etc., which can be caused by intestinal inflammation stimulation. If the diarrhea is not relieved in time, it can cause water-electrolyte imbalance, dehydration, dizziness, nausea, weakness and other symptoms. 3. Adverse drug reactions: dizziness, diarrhea, nausea may be caused by adverse drug reactions. For example, amoxicillin and moxifloxacin and other antibiotics can cause gastrointestinal symptoms. Drug use should carefully read the instructions to pay attention to adverse drug reactions, so as not to cause discomfort. There are many causes of dizziness and nausea diarrhea, dizziness and nausea diarrhea and other symptoms, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor to determine the cause of the disease, in order to avoid delaying the condition.