Early pregnancy 50 days of pregnancy vomiting suddenly reduced, may be the individual physical factors, early pregnancy reaction gradually alleviate, embryonic abortion and so on caused by the performance. 1. Individual physical factors: some pregnant women in about 50 days of pregnancy, may gradually adapt to the body sex hormone level changes, may cause a sudden reduction in pregnancy vomiting, may be a normal performance. 2. Gradual relief of early pregnancy reaction: around 50 days of pregnancy, some pregnant women may have a slight early pregnancy reaction, with the change of diet and living habits, there may be a sudden relief of pregnancy vomiting. 3. Embryonic arrest: at 50 days of pregnancy, if the embryo stops growing and developing, the level of sex hormones in the body decreases significantly, which may lead to a sudden reduction in pregnancy vomiting. Early pregnancy 50 days of pregnancy vomiting suddenly reduced, need to go to the hospital in a timely manner, according to the specific conditions of the examination.