Severe pregnancy vomiting can be caused by three things.
Changes in the body: High levels of HCG in the body reduce the acidity in the stomach, leading to a slowing of peristalsis and impaired gastric emptying. In early pregnancy, the HCG level in the body will increase, which will cause nausea and vomiting in pregnant women; during pregnancy, sex hormones in the body will also increase, and the increased level of estradiol will also aggravate the symptoms of nausea and vomiting. Progesterone acts with the gastrointestinal tract, which can inhibit the smooth muscle, slow down the peristalsis of the gastrointestinal tract, reduce gastric emptying, decrease appetite, distend the stomach and make it easy to have pregnancy vomiting.
Diet and habits: Now many women, although pregnant, continue to work as usual, work a lot, often neglect their diet and rest, can also lead to vomiting, must ensure adequate rest and intake of adequate nutrition.
Psychological role: pregnancy is prone to negative emotions, thus affecting the changes in the level of endocrine hormones in the body, nausea and vomiting will be more intense.