The main reasons for nausea and wanting to vomit white foam in the morning include: gastritis, reflux esophagitis, food poisoning, and accidental consumption of pesticides. 1. Gastritis: it can be related to Helicobacter pylori infection and prolonged bad dietary habits, which can easily cause gastrointestinal dysfunction, nausea, vomiting, abdominal distension and abdominal pain. If the acute attack of gastritis occurs in the morning, due to the lack of food, it will produce the phenomenon of wanting to vomit and acid reflux. 2. Reflux esophagitis: it can be caused by the decline of anti-reflux function or delayed gastric emptying, which is mainly manifested by the influx of gastric contents into the oral cavity, accompanied by heartburn, which can appear nausea, want to vomit the phenomenon of foaming. 3. Food or pesticide poisoning: If you ingest food contaminated by bacteria or viruses in the morning, or accidentally ingest pesticides, etc., it can cause toxic reactions, nausea, regurgitation, foaming phenomenon. 4. Other: In addition to digestive diseases, fever convulsions, epilepsy and other diseases can also cause nausea in the morning, foaming at the mouth, and need timely medical attention and treatment. In short, nausea in the morning, foaming at the mouth phenomenon, it is recommended that timely medical treatment, under the guidance of the doctor symptomatic treatment.