Drooling during late pregnancy may be a normal physiological phenomenon, related to changes in hormone levels, and may also be caused by some diseases, which can be roughly judged according to different performances, if accompanied by other obvious symptoms, you can seek medical examination to clarify the cause and treat the cause. 1, physiological phenomenon: during pregnancy, due to the increase in estrogen and progesterone levels will stimulate the salivary glands, resulting in excessive saliva secretion, which in turn causes drooling; 2, oral diseases: women with oral diseases in late pregnancy, such as caries, gum or periodontal diseases, can also stimulate salivary gland secretion, resulting in excessive saliva secretion, causing drooling; 3, stomach acidity, gum disease, etc. Oral diseases: if there are oral diseases in women in late pregnancy, such as dental caries, gum or periodontal diseases, it can also stimulate salivary gland secretion, resulting in excessive saliva secretion, causing the phenomenon of drooling; 3, acid reflux: due to the increasing volume of the uterus in late pregnancy, compression of the gastrointestinal tract, causing gastric reflux, which in turn stimulates the salivary glands in the mouth to secrete saliva, resulting in the phenomenon of drooling; 4, improper sleeping position. Late pregnancy belly is relatively large, pregnant women sleep more side-lying, which may lead to the phenomenon of drooling. In addition, if suffering from anterior malocclusion can also lead to the phenomenon of drooling, usually caused by genetic factors or acquired bad stimulation, such as biting the pencil, chewing nails, etc., and pregnancy is not directly related to the phenomenon of drooling can occur before pregnancy, without intervention, it leads to late pregnancy drooling, patients can take relevant orthodontic treatment after the birth. For women with drooling in late pregnancy, they can elevate the pillow appropriately when sleeping and do a good job of oral cleaning on a daily basis. At the same time, pay attention to a light diet, appropriate supplementation of vitamins and trace elements, avoid the intake of spicy, stimulating and cold foods, and appropriate activities to enhance the body’s resistance.