How do stretch marks occur?

Stretch marks are irregular lines that appear on a woman's belly after she becomes pregnant. They often feel itchy and stinging after scratching. Many people don't know how stretch marks occur. It is the cracks caused by the pregnant woman's belly becoming tighter and tighter after being propped up by the fetus, and the skin being overstretched. Moreover, it does not disappear after women give birth, making the skin appear loose, causing great distress to women.

Causes of stretch marks:

1. During pregnancy, the adrenal glands secrete a large amount of glucocorticoids, which increase the fragility of the skin's elastic fibers and collagen fibers. When the elasticity of the skin's elastic fibers and collagen fibers reaches a certain limit, it will cause the elastic fibers and collagen fibers to break, forming stretch marks.

2. When the pregnancy lasts for more than 3 months, the slowly enlarged uterus protrudes from the pelvic cavity and develops into the abdominal cavity. The abdomen begins to swell, and under the influence of the enlarged uterus, the elastic fibers of the skin and the abdominal muscles begin to stretch. This is especially evident after 6 months of pregnancy. When it exceeds a certain limit, the elastic fibers of the skin break, and irregular pink or purple longitudinal cracks appear on the abdominal skin, so expectant mothers should control the rate of weight gain.

3. If you lack exercise for a long time or do not have good skin care habits, it may cause weakening of waist and abdominal muscles and poor skin elasticity. Such expectant mothers are more likely to develop stretch marks.