Stretch marks are usually likely to appear when a woman is 5-6 months pregnant. During pregnancy, the adrenal cortex secretes more glucocorticoids, which can break down elastin and denature the elastic fibers. Generally at 5-6 months of pregnancy, stretch marks appear due to the increase in uterine enlargement which will increase the skin tension on the abdominal wall of pregnant women, resulting in the breakage of skin elastic fibers. The elasticity of the skin varies from one pregnant woman to another, so the timing of the appearance of stretch marks varies. Most women may appear when they are 5-6 months pregnant, some may appear only one month before labor, and even some pregnant women do not have stretch marks, which is normal. In early pregnancy, women can use olive oil to apply on the small abdomen, and then gently massage, which is conducive to increase the elasticity of the skin and prevent or reduce the occurrence of stretch marks. During pregnancy, pay attention to more rest, at the same time should relax, avoid tension, anxiety, any discomfort should be timely to the hospital, by the doctor to clarify the diagnosis, and cooperate with the doctor to deal with the symptoms.