The stomach is always nausea may be related to pregnancy, psychological factors, disease factors and so on. 1. Pregnancy: If you have a history of sexual intercourse and are a woman of childbearing age, you may be in the early stages of pregnancy, when hormone levels in your body change, causing gastrointestinal discomfort and nausea. 2. Psychological factors: anxiety, nervousness, fear and other emotions can easily cause plant nervous system dysfunction and nausea. 3. Disease factors: such as gastroesophageal reflux, gastric ulcer, cholecystitis, etc., gastric acid secretion to stimulate the stomach wall may cause gastrointestinal discomfort, nausea. Stomach nausea can also be seen in other causes, it is recommended to consult a doctor in a timely manner, follow the doctor’s instructions for relevant examinations, with the help of the doctor to clarify the cause, and targeted treatment or therapy.