There are many reasons for stomach discomfort and nausea and vomiting, such as gastritis, gastric ulcer, early pregnancy reaction, etc. It is necessary to clarify the cause of the disease and treat the cause. 1. Gastritis: Inflammatory reaction of the gastric mucosa, resulting in stomach pain, bloating, nausea and vomiting, etc., which is obvious when eating stimulating food, you can choose omeprazole, bismuth potassium citrate and other drugs under the guidance of the doctor for treatment. 2. Gastric ulcer: The gastric mucosa is broken, resulting in ulcers on the inner lining of the stomach, with symptoms such as decreased appetite, nausea and vomiting, and gastric distension, etc. Under the guidance of a doctor, drugs such as omeprazole and rabeprazole can be chosen to alleviate the symptoms. Improve the Helicobacter pylori breath test clearly have infected people, also need to be under the guidance of the doctor for sterilization treatment. 3. Early pregnancy reaction: early pregnancy may lead to stomach discomfort, nausea, vomiting, fatigue and other manifestations, is a normal physiological reaction, usually 12 weeks after the gradual alleviation, you can eat more fruits and vegetables, vitamin supplements, to alleviate the reaction. Nausea and vomiting may also be related to gastroesophageal reflux and gastric cancer, so it is recommended to go to the hospital in time to clarify the cause of the disease and take active treatment to avoid affecting your health.