Before treating the symptoms of food poisoning, it is important to figure out what caused it. Think back to the food you ate in the last 4 to 36 hours. Did you try something new? Did anything taste slightly off? Did you share food with a friend or family member who is also experiencing the same symptoms? Here are the most likely causes of food poisoning:  Food that has been contaminated by E. coli, Salmonella, and other types of bacteria. Bacteria are usually killed when food is cooked and handled properly, so this type of food poisoning usually results from undercooked meat or food that was left sitting out without refrigeration. Poisonous fish, such as puffer fish, are also a common source of food poisoning. Puffer fish should not be consumed unless it has been prepared by staff at a restaurant that is certified to do so. Poisonous wild mushrooms, looking identical to edible mushrooms, can also cause food poisoning. Food poisoning that was caused by bacteria, especially when it strikes an otherwise healthy person, is usually treatable at home. However, depending on the source of the food poisoning and the age of the person who has it, it may be necessary to seek medical help immediately. Call a doctor under the following circumstances:  If the food poisoning is due to poisonous fish or mushrooms. If patient is an infant or a young child. If the patient is pregnant. The person with food poisoning is over 65 years of age. Frequent diarrhea or vomiting The person with food poisoning is experiencing severe symptoms, such as trouble breathing, dizziness or fainting, or vomiting blood.

TL;DR in Vietnamese:
Tìm hiểu nguyên nhân gây ra ngộ độc thực phẩm. Đi bệnh viện ngay lập tức nếu cần thiết.