Great thirst in pregnancy may be caused by physiological reactions during pregnancy, excessive salt intake, gestational diabetes, gestational diabetes mellitus, gestational uremia and other reasons. 1. Physiological reaction to pregnancy: women’s metabolism increases after pregnancy, easy to sweat, coupled with the early pregnancy reaction may be insufficient dietary intake, such as leading to a lack of water, the pregnant woman appeared to be thirsty symptoms, mostly physiological phenomena, can continue to observe, generally do not need special treatment. 2. Increased salt intake: some women like to consume heavier food after pregnancy, resulting in excessive salt intake, resulting in thirst symptoms. Pregnant women should also pay attention to a light diet to avoid excessive salt intake. 3. Gestational diabetes mellitus: Pregnant women with decreased insulin sensitivity in the late stages of pregnancy are prone to gestational diabetes mellitus causing pregnant women to thirst, producing symptoms such as excessive drinking, urination, and eating. 4. Gestational uremia: the placenta can produce N-terminal aminopeptidase, leading to a lack of arginine pressin, producing uremia, manifested as extreme thirst, polyuria, drinking a lot of water and so on. Generally after delivery, it will get better by itself. Pregnant women with great thirst should consult the doctor in time to rule out abnormalities, improve the examination under the guidance of the doctor, and give appropriate treatment.