Pregnancy can be said to be the most ups and downs of a woman’s life – disturbed mood, peculiar taste preferences and various physical discomfort, not only to the pregnant women with great inconvenience, but also on their physical and mental health has caused a huge impact. According to reports, experts have recently found the root cause of the problem for the majority of pregnant women, saying that it may be due to the human body hormone “haunted”. Typically, most women become clumsy in the early stages of pregnancy, often tripping over themselves. Research has found that there is a reason for this – a hormone called relaxin is secreted during early pregnancy, which promotes the relaxation of the body’s joints, ligaments and muscles, and is especially useful for stretching the pelvis during labor. It is because of its relaxing effect that the phenomenon of unsteady holding of things may occur from time to time in the early stages of pregnancy. In addition, due to the role of relaxin, pregnant women esophageal muscle folds are not as good as before, resulting in easy reflux of gastric acid, and thus many pregnant women often have a burning sensation in the stomach. During pregnancy, many pregnant women have an increased appetite and a fervent pursuit of specific flavors, which can lead to impulsive eating. Studies have found that taste preferences change at different stages of pregnancy: in early pregnancy, pregnant women have a particular aversion to bitter flavors, and in middle and late pregnancy, their preference for salty as well as sour flavors gradually increases. Salty flavors are also preferred during pregnancy and during the physiological cycle, when women may need to take sodium supplements to maintain electrolyte balance due to dehydration and electrolyte disorders. In the early stages of pregnancy, when women’s moods fluctuate greatly, the ovaries produce estrogen and progesterone, and in the sixth week of pregnancy, estrogen levels can be as high as three times the peak of a woman’s physiological cycle. Both of these hormones have a huge impact on female brain function, and estrogen promotes the secretion of dopamine in the brain regions that control human emotions and behaviors, thus causing pregnant women’s moods to fluctuate. Finally, it is recommended that the family and friends of pregnant women should be more understanding and caring, which will help the physical and mental health of both the pregnant woman and the baby.