When does early pregnancy nausea begin?

Early pregnancy nausea usually shows up at about 6 weeks after menstruation stops. Most pregnant women will show nausea, vomiting, loss of appetite, general fatigue, vomiting when they see greasy food, etc., which we call early pregnancy reaction. Some will be accompanied by emotional changes, very easy to lose temper, irritability, many of these symptoms will disappear at 12 weeks of pregnancy, but some will last longer. The severity of early pregnancy reaction is related to personal constitution. Of course, if early pregnancy reaction is particularly serious, it is necessary to rule out twins and be alert to the possibility of hydatidiform mole.