Nausea at the smell of greasy food is the first thing to rule out liver disease for this symptom. Like acute and chronic hepatitis B, abnormal liver function, etc., this symptom can easily appear. Secondly, gastrointestinal disorders such as indigestion and gastroesophageal reflux may also occur. If it is caused by gastrointestinal diseases, it can be recommended to eat more vegetables and fruits recently, and less fried and spicy food can be improved. For liver disease, a detailed examination may be required at the hospital to check hepatitis B virus markers as well as liver function and, if necessary, hepatobiliary ultrasound to rule it out. If a woman is of childbearing age, she should also consider whether this symptom is caused by pregnancy reaction due to early pregnancy.