The manifestations of pregnancy are more diverse and can be categorized into reproductive system changes, breast changes, skin changes and other items. 1. Changes in the reproductive system: the gradual enlargement of the uterus is the most obvious change during pregnancy. At the same time, the ovaries are slightly enlarged during pregnancy, ovulation stops, and the corpus luteum of pregnancy is visible; the labia majora and minora are hyperpigmented, and their extension increases to facilitate the delivery of the fetus. The vaginal mucosa becomes softer, with more folds and increased extensibility. Lactic acid content increases, so that the vaginal pH is lowered, which is conducive to the prevention of infection. 2. Breast changes: Breasts may be significantly enlarged and engorged with blood, feeling breast swelling and tenderness, accompanied by enlarged and darkened nipples and easy erection. 3. Skin changes: Due to the large increase in the secretion of melanin-stimulating hormone and hormones such as estrogen and progesterone, there may be a deepening of the skin color of the nipple, areola, white line of the abdomen, vulva, etc., and butterfly-shaped brown spots may appear on the cheeks. In addition, due to the excessive expansion of the skin elastic fiber rupture, the abdomen, thighs, buttocks and other places can appear a lot of purple or red irregular parallel cracks, called stretch marks. In addition, pregnancy is accompanied by endocrine changes, cardiovascular changes, respiratory changes, etc., but these items need to be clarified by laboratory tests, etc., and it is recommended to strengthen the physical examination to dynamically detect these changes during pregnancy.