Nausea and vomiting after eating snacks is mainly considered snacks are not clean or too greasy physiological factors, or chronic gastritis, dyspepsia and other pathological factors. 1. Physiological factors: If there are hygiene problems with the snacks, they are not clean, which may lead to pathogens infecting the gastric mucosa after eating, causing gastroenteritis and making the patient nauseous and wanting to vomit after eating snacks. If you eat too much at one time, or snacks are too greasy, not well digested, and too spicy, etc., will produce stimulation of the gastric mucosa, causing nausea and vomiting after eating snacks. 2. Pathological factors: mainly gastrointestinal diseases, such as chronic gastritis, dyspepsia, intestinal flora imbalance, peptic ulcer, etc., will make the gastrointestinal tract digestion, absorption and peristalsis dysfunction, when eating snacks may cause nausea and vomiting. When patients have long-term or repeated symptoms of nausea and vomiting after eating snacks, it is recommended to seek timely medical attention to identify the cause of the disease and carry out targeted treatment to avoid delaying the condition.