Nausea and vomiting after eating greasy things may be caused by gastrointestinal stress, acute pancreatitis, acute cholecystitis, early pregnancy and other reasons. 1. Gastrointestinal stress: after a long time of light diet, suddenly eat greasy things, there may be a stress reaction, manifested in nausea and vomiting and other phenomena, adjusting the diet can be, do not worry too much. 2. Acute pancreatitis, acute cholecystitis: after eating greasy things, if there is sudden abdominal pain, nausea and vomiting, it may be pancreatitis, cholecystitis, you can take ceftazidime, ceftriaxone and other drugs to fight infection, gastrointestinal decompression, fasting and other treatment. 3. Early pregnancy reaction: Early pregnant people have a greater reaction to greasy food, nausea and vomiting can occur after eating greasy food, which is a normal phenomenon. Nausea and vomiting after eating greasy food, there are other reasons, such as gastroenteritis, etc., it is recommended to go to the hospital, to clarify the cause of the disease, and timely symptomatic treatment.