Nausea is easy to appear in the sixth week of pregnancy, this is the early pregnancy reaction, and fetal development has no obvious relationship, mainly due to the body chorionic gonadotropin increase, gastric acid secretion and gastric emptying time prolonged caused by. Generally speaking, after 12 weeks of pregnancy, as the level of chorionic gonadotropin in the body decreases, it can be gradually relieved and disappear, so there is no need for special treatment during this period. The main thing is to regulate the diet structure, with high protein, high vitamin light and easy to digest diet, small and frequent meals, avoid stress and anxiety and tiredness, if necessary, you can consider taking oral vitamin B6 to relieve the symptoms.