Dizziness, nausea and vomiting after eating can be caused by the following situations: 1. If you eat expired food or unclean food, it can lead to food poisoning, and the manifestations of food poisoning include dizziness, nausea and vomiting; 2. Dizziness, nausea and vomiting after eating may be a redistribution of blood, and food will be absorbed and metabolized in the gastrointestinal tract during meals, which will cause blood to gather in the blood vessels of the gastrointestinal tract. The blood volume of the whole body is fixed, and when the blood is concentrated in the gastrointestinal tract it will cause a relative shortage of blood supply to the brain. Only in patients with severe cerebrovascular stenosis, severe anemia, and neurological dysregulation will they experience significant discomfort, including dizziness, nausea, and vomiting after eating.