Early pregnancy long mouth ulcers may hormonal changes and psychological factors, caused by the digestive system, food stimulation or infection caused. 1. Hormonal changes and psychological factors: changes in the level of estrogen and progesterone in a woman’s body may cause mouth ulcers to occur easily. At the beginning of pregnancy, if the pregnant woman is under psychological pressure, coupled with the influence of pregnancy reaction, these can be the cause of mouth ulcers. 2. Digestive system causes: pregnancy in the hormonal influence and uterine compression of a variety of factors, the mother-to-be body digestive system greatly reduces the ability to often appear constipation, indigestion and gastritis and other uncomfortable symptoms, digestive problems after the body’s immunity to fight against bacteria and viruses reduce the ability to do so. 3. Food stimulation: some mothers do not pay attention to their daily diet, eat spicy and stimulating foods such as tobacco, alcohol, beverages, chili peppers and barbecue and other foods, these foods will stimulate the human body oral mucosa, the skin in the oral cavity breaks down and it is easy to occur after mouth ulcers. 4. Infection: Early pregnancy immunity decline, pregnancy worry about cold body cold accidentally will keep warm too much, coupled with the impact of other bad habits, the mouth may occur viral infections, mouth ulcers will occur. Suggestions should be to improve lifestyle habits, maintain a happy mood, mouth ulcers should be treated under the guidance of a doctor, do not blindly use drugs without authorization.