It is usually considered as a symptom of early pregnancy reaction caused by the elevated level of progesterone, which is generally normal and requires no special treatment. The common cause is mainly in early pregnancy, due to the increase of human chorionic gonadotropin level, which stimulates the gastrointestinal tract and leads to the decrease of gastric acid secretion and the weakening of intestinal peristalsis, causing the discomfort of gastrointestinal tract. It may manifest as nausea, vomiting, loss of appetite, and aversion to oil. Around 12 weeks of pregnancy, it can gradually disappear with the decline of progesterone. Relief measures 1, improve diet: diet should be light and easy to digest, try to eat less and more meals, avoid greasy and spicy food, such as barbecue, fried skewers, etc.. You can eat more appetizing fruits; 2. Adjust work and rest: ensure good sleep, pay more attention to rest, don’t stay up late and avoid strenuous activities; 3. Relax: usually you can read your favorite books, listen to soothing music or take a walk to eliminate tension and anxiety to prevent the early pregnancy reaction from worsening; 4. In case the fetus cannot take in enough nutrients or the pregnant woman has electrolyte disorders, ketoacidosis and other symptoms; 5. Regular maternity checkups are also needed to keep an eye on the development of the fetus.