There are a number of stomach disorders that cause nausea and vomiting. First of all, the most common is acute gastroenteritis, which is mainly related to the recent irregular diet and unclean food. Secondly, gastric ulcers can also cause nausea and vomiting due to stomach upset caused by irritation from stomach acid, food residue, etc. In addition to these two most common gastric diseases, there are many other causes of nausea and vomiting symptoms, such as motion sickness (which is commonly known as motion sickness and seasickness), which is mainly related to the cochlea, semicircular canals and so on. Acute enteritis, nausea, vomiting and diarrhea can also occur. Food poisoning, such as undercooked string beans, can lead to food poisoning and nausea and vomiting. There are also other causes, such as excessive alcohol consumption, side effects of medications, and drug poisoning.