There are many possible causes of thirst in early pregnancy, which may be due to normal physiological changes or due to diabetes combined with pregnancy, etc. The cause should be clarified in time and treated as early as possible. Physiological situation, early pregnancy, fertilized egg implantation, in order to meet the embryo’s continuous growth and development needs, pregnant women in vivo estrogen level rises, can lead to the body of water and sodium retention, too much water stored in the tissue gap, can reflexively stimulate the nerve center triggered by the symptoms of thirst, this situation does not require special treatment, the prognosis is good. If the pregnant woman suffers from diabetes, the hormone level of the pregnant woman’s body changes in early pregnancy can lead to a decrease in the body’s sensitivity to insulin, blood glucose abnormally high, resulting in pregnant women’s thirst, serious cases can lead to diabetic ketoacidosis endangering the life of the mother and child, the need for timely treatment. Pregnant women with symptoms of thirst should seek medical attention in a timely manner to determine the cause of the disease, and if necessary, early treatment, so as not to delay the condition leading to adverse consequences.