Pregnant women with blisters on their mouths first need to determine what nature of blisters and what causes them. Most of the blisters on the mouth of pregnant women are caused by fire. This situation pregnant women should pay attention to diet, eat less spicy greasy stimulating food, eat more light fire food such as bitter melon, pear, etc., to develop the habit of drinking more water, pay attention to rest to ensure normal sleep. Usually, you can also exercise properly to improve your resistance, so that you will also have a pleasant mood. In addition, the lack of vitamins in the body can also lead to blisters on the mouth. Vitamins maintain and improve the epithelial tissue, and a lack of them can make the cell epithelium susceptible to damage, thus causing blisters on the mouth. This requires vitamin-rich vegetables and fruits, such as bananas, kiwis, tomatoes, etc. to supplement the vitamins, or some multivitamin tablets under the guidance of a doctor. Some pregnant women’s mouth bubbles are caused by herpes simplex virus infection caused by oral diseases, often by the cold, lack of sleep, depression, stress and anxiety, resulting in a decline in immunity and disease. So in normal life pregnant women should eat reasonably, ensure sleep, exercise properly and keep a smooth mood. If the bubble on the mouth is long and serious, it is recommended to go to a regular hospital for examination and use medication under the guidance of a doctor.