Feeling nauseous after eating greasy food should open the window to ventilate or go outdoors to breathe fresh air, or you can use the finger emetic method to spit the greasy food out of the body. After calming down, you can drink warm boiled water, tea, yogurt, Vitamin C drinks, etc. You can also drink vinegar appropriately to promote digestion and relieve nausea. You can also consume foods that taste sour such as oranges and lemons, or vegetables such as onions and carrots to eliminate bloating and relieve nausea. Or rub your palms together to warm them and massage your abdomen clockwise to relieve discomfort. Discomfort can also be relieved by taking digestive enzyme preparations and gastrointestinal stimulants. It is important to develop good eating habits, eat three meals a day at regular intervals, avoid overeating, increase physical activity to regulate gastrointestinal function, and take probiotic preparations to promote digestion if necessary.