Gingivitis during pregnancy is a condition that often occurs in women when they are pregnant. Due to endocrine changes, the exudation of body fluids from the blood increases and mast cells in the gums are destroyed by the action of sex hormones, releasing also protein hydrolases and histamine, causing inflammatory reactions such as redness, swelling and easy bleeding in the gums. Gingivitis during pregnancy often occurs in the second to third month after pregnancy, and some pregnant women also form gestational gingival tumors, which grow up and prevent eating. These symptoms usually subside on their own after delivery. Although gum bleeding during pregnancy is related to endocrine changes in the body, it is also related to factors such as unclean oral hygiene or misalignment of teeth in pregnant women. Therefore, young women should actively treat gingivitis and periodontitis before pregnancy to prevent the occurrence of gingivitis during pregnancy and the aggravation of periodontitis. Once suffering from gingivitis during pregnancy, those with serious conditions should be seen in a timely manner, and those with mild conditions should be treated actively after delivery.