What causes nausea and vomiting?

　　In general, nausea and vomiting refer to the symptoms of feeling sick and throwing up. Nausea and vomiting may be caused by vigorous exercise, visual stimuli, food poisoning, gastritis, or peptic ulcers. If you experience any discomfort, please seek medical attention promptly and undergo symptomatic treatment under the guidance of a qualified physician. Detailed explanations are as follows:

　　1. Vigorous Exercise

　　During vigorous exercise, the body requires more oxygen and energy, which may cause faster breathing and heart rate, and accelerated blood circulation. These physiological changes can sometimes trigger a sensation of nausea and vomiting. Before engaging in vigorous exercise, perform adequate warm-up exercises. During exercise, stay properly hydrated to avoid dehydration, and rest appropriately afterward to allow the body to recover gradually.

　　2. Visual Stimulation

　　Seeing spoiled, unclean, or otherwise unpleasant food may cause the brain to produce a rejection response, leading to nausea and vomiting. It is recommended to avoid directly viewing foods or scenes that might cause discomfort. Maintain good dietary hygiene and choose fresh, clean foods.

　　3. Food Poisoning

　　Consuming food or water contaminated by bacteria, viruses, or parasites may lead to food poisoning. These harmful substances can irritate the gastric mucosa or intestinal walls, causing symptoms of nausea and vomiting. Abdominal pain and diarrhea may also occur. Under a doctor's guidance, medications such as norfloxacin capsules, ciprofloxacin hydrochloride tablets, or smectite powder may be used for treatment.

　　4. Gastritis

　　Gastritis may be related to long-term irregular eating habits, overeating, or consuming irritating foods. When the gastric mucosa is damaged, inflammatory stimulation may lead to nausea and vomiting, often accompanied by symptoms such as abdominal distension and belching. Patients may take medications such as sucralfate oral suspension, colloidal bismuth pectin capsules, or omeprazole enteric-coated capsules according to medical advice.

　　5. Peptic Ulcer

　　Peptic ulcers may be caused by excessive gastric acid secretion, Helicobacter pylori infection, and other factors. When the gastric mucosa is damaged and ulcers form, irritation can lead to nausea and vomiting. Symptoms such as abdominal pain and acid reflux may also appear. Under a doctor's recommendation, patients may use medications such as amoxicillin clavulanate potassium tablets, clarithromycin tablets, or ranitidine hydrochloride capsules to relieve symptoms.

　　In daily life, maintain good dietary hygiene and avoid consuming unclean food. Keep regular eating habits, avoid overeating and consuming irritating foods. Additionally, maintain a positive mindset and emotional well-being, engage in appropriate outdoor activities, and relax both mind and body.