Nausea and vomiting in the middle of the night may not necessarily be pregnancy, but may also be caused by digestive system diseases or poor dietary habits, etc. The causes need to be clarified after comprehensive analysis. 1.Early pregnancy reaction: The rise of HCG value and progesterone in early pregnancy will stimulate the vomiting center and cause nausea, vomiting and other adverse reactions, which may also be accompanied by menopause, drowsiness and weakness. Generally, a blood test for HCG and ultrasound examination of the gestational sac are required to determine whether pregnancy is present. If there is only nausea and vomiting in the middle of the night, it is difficult to determine whether it is pregnant; 2, digestive system diseases: acute gastrointestinal inflammation, bacterial dysentery, intestinal obstruction, food poisoning, gastrointestinal ulcer, cholecystitis and other diseases can lead to nausea and vomiting symptoms, in addition to nausea and vomiting can also be accompanied by diarrhea, fever, general malaise, fatigue and other symptoms, generally lasting longer, in serious cases, can lead to dehydration, need to promptly seek medical 3, bad eating habits: too much dinner, unclean diet, poor diet, eating greasy, high sugar, indigestible food, can lead to nausea and vomiting in the middle of the night, generally after warmth, medication can be as soon as possible to alleviate the symptoms, daily attention should be paid to regular eating habits, avoid too hungry and too full, as well as cold, greasy, stimulating food; 4, cold and fever: some people appear in the middle of the night Nausea, vomiting is caused by cold and fever, mostly due to improper warmth and cold at night, can also be accompanied by cough, runny nose and other symptoms, need timely symptomatic treatment.