Having no appetite and wanting to vomit may be caused by physiological phenomena or pathological phenomena, such as food poisoning, gastroenteritis, pharyngitis and so on. 1. physiological phenomenon: due to stress, sadness, anger and other emotional reasons, leading to digestive system stress, gastrointestinal dysfunction, causing vomiting, no appetite symptoms. 2. Pathological phenomena. (1) Food poisoning: Eating food containing poisonous substances, the poisonous food includes bacteria, chemical poisons, etc. The patient often shows nausea, vomiting, and lack of appetite. (2) Gastroenteritis: unclean diet, overeating, spicy and irritating food may lead to acute gastroenteritis, causing nausea, vomiting and other symptoms. (3) Pharyngitis: discomfort or even pain in the pharynx makes it difficult to swallow food, which leads to a decrease in appetite, and irritating cough caused by pharyngitis may lead to nausea, vomiting and other symptoms. The cause of the lack of appetite to eat and want to vomit may also be chronic pancreatitis or cholecystitis, etc., need to improve the relevant examination specific analysis. If you feel unwell, you should consult a doctor in time to identify the specific cause and follow the doctor’s instructions.