Nausea, vomiting and hiccups in early pregnancy are very normal physiological phenomena, also known as early pregnancy reaction, mainly caused by digestive disorders. In the early stages of pregnancy, women’s body hormone level fluctuation is more obvious, especially chorionic gonadotropin, also known as blood HCG rise is very obvious. This elevated hormone will lead to a slowing down of gastrointestinal motility and prolonged retention of food in the digestive tract, which may cause constipation, bloating, diarrhea, nausea, vomiting, as well as acid reflux, hiccups, and other physiological phenomena, and these symptoms will be at their peak in the 6th to 8th week of pregnancy. After the tenth week of pregnancy, HCG levels gradually decrease and the symptoms disappear naturally.