Pregnant mouth ulcers are very serious may be related to traumatic factors, nutritional deficiencies, endocrine disorders, etc., according to the different causes of general treatment and drug therapy. 1. Traumatic factors: If the pregnant woman’s mouth is stimulated by external factors such as broken teeth, tooth remnants, caries, etc., it can lead to mouth ulcers, and it is recommended to treat them with jaw adjustment and filling during the safe period. 2. Nutritional deficiencies: pregnant women who are pregnant, if the nutritional food is insufficient, unbalanced or lack of a variety of vitamins, can lead to mouth ulcers. Pregnant women can supplement vitamin C tablets, vitamin B complex tablets, folic acid tablets and so on to relieve the symptoms of ulcers. 3. Endocrine disorders: mostly related to physiological factors, emotions and so on. It is recommended to use topical isacridine lactate solution, rehabilitation of new liquid, compound chlorhexidine gargle, etc. for treatment. Pregnant mouth ulcers are very serious, there may be other reasons, it is recommended that the patient timely consultation, follow the doctor’s prescription medication, not unauthorized use of drugs in order to avoid affecting the fetus.