The causes of nausea are the following: i. If a woman is nauseous, she needs to consider the possibility of pregnancy, and nausea can occur in early pregnancy. Second, nausea may also be gastroesophageal reflux disease, which may also be accompanied by symptoms such as acid reflux and loss of appetite. Third, it may also be a stomach disease, such as Helicobacter pylori infection, acute and chronic gastritis, superficial gastritis, erosive gastritis, hemorrhagic gastritis, ulcerative gastritis, atrophic gastritis, gastric polyps, gastric cancer, etc. Fourth, it may also be liver disease, gallbladder disease, pancreatic disease, such as acute and chronic hepatitis, cirrhosis, liver cancer, gallstones, cholecystitis, etc. will show symptoms of nausea. V. Acute coronary syndrome may also show symptoms of nausea.