Mid-pregnancy nausea may be related to a variety of reasons, in addition to dietary reasons, environmental reasons, uterine pressure, etc., but also may be gastrointestinal diseases, liver and gallbladder disease, at this time need to be vigilant. 1, dietary reasons: pregnant women eat greasy and irritating food or unclean food, will stimulate the gastrointestinal tract, nausea and vomiting reaction, some pregnant women can be accompanied by diarrhea, abdominal pain and other symptoms; 2, environmental reasons: indoor air does not flow, or poor environmental hygiene and odor, may also lead to nausea. The poor ventilation, or poor environmental hygiene and odor may also lead to nausea in pregnant women, which can usually improve after getting out of the bad environment; 3, uterine pressure: the uterus gradually increases in mid-pregnancy, which will press upward on the diaphragm and stomach, causing the stomach capacity to become smaller, which may cause pregnant women to have a loss of appetite, nausea, regurgitation and other phenomena; 4, gastrointestinal diseases: if the mid-pregnancy is complicated by acute gastritis, enteritis and other diseases, there will be Gastrointestinal dysfunction and other conditions, will also cause nausea in mid-pregnancy; 5, liver and gallbladder diseases: If the mid-pregnancy is complicated by viral hepatitis, chronic cholecystitis and other diseases, it will also lead to pregnant women’s loss of appetite, nausea, vomiting and so on. If the symptoms of mid-pregnancy nausea continue to be unrelieved and accompanied by other uncomfortable symptoms, it is recommended to go to the hospital in time for examination to clarify the cause and treat the cause, so as not to cause adverse effects on the pregnant woman and the fetus.