Nausea after eating greasy food may be a normal physiological phenomenon, or it may be an early pregnancy reaction, in addition, if you suffer from viral hepatitis, gastritis, chronic cholecystitis and other diseases, this situation will also occur. 1. Normal physiological phenomenon: due to individual differences, some people have difficulty in tolerating greasy food itself, especially after eating too much greasy food at one time, then nausea is easy to appear. 2. Early pregnancy reaction: nausea after eating greasy food is also seen in early pregnancy reaction of women of childbearing age, which is related to hormonal changes in the body, and this situation is also a normal physiological phenomenon. 3. Viral hepatitis: such as hepatitis A, B, C, D, E, generally cause damage to liver cells, the ability to digest fat will also be reduced, so it is easy to eat greasy food after a greasy, nausea symptoms. 4. Gastritis: If there is acute and chronic inflammation of the stomach, gastrointestinal dysfunction will be induced by the stimulation of greasy food, and nausea can also occur at this time. 5. Chronic cholecystitis: chronic cholecystitis patients, if the diet is not appropriate, eating too much greasy food is likely to induce acute cholecystitis, nausea, vomiting, abdominal pain symptoms. The causes of nausea after eating greasy food include indigestion, etc. Once the relevant symptoms appear, it is recommended to consult a doctor at the first time to avoid delaying the condition.