Seven months pregnant without pregnancy line

Many pregnant women still find that they have no stretch marks on their bodies after seven months of pregnancy. They feel very strange at this time. In fact, everyone's physical condition is different. Some pregnant women will not develop stretch marks if they have better skin. In this way, it will not affect the beauty of their skin surface and prevent the skin from becoming loose.

The formation of stretch marks is mainly due to the influence of hormones during pregnancy. In addition, the distending abdomen causes the elastic fibers and collagen fibers of the skin to be damaged or broken, and the abdominal skin becomes thinner and finer, resulting in some pink or purple wavy patterns of varying widths and lengths. After delivery, these patterns will gradually disappear, leaving behind white or silvery shiny scar lines, also known as stretch marks.

Stretch marks mainly appear on the abdominal wall, and may also appear on the inner and outer thighs, buttocks, chest, lower back and arms. This is most obvious in primiparas. Once stretch marks appear, they will not disappear and will be accompanied by sagging skin, sagging breasts, and accumulation of abdominal fat, which will seriously affect women's body shape and physical and mental health after childbirth.

* Caused by hormonal changes during pregnancy.

* The subcutaneous tissue is stretched and ruptured: With the expansion of the uterus, the growth of the fetus and the increase of amniotic fluid, the abdomen of the pregnant woman will swell rapidly. At this time, the epidermis and dermis can keep up with the speed of extension, but the subcutaneous tissue cannot keep up with the speed of abdominal expansion, causing the collagen fibers and even elastic fibers rich in the subcutaneous tissue to be unable to withstand the expansion and rupture. This can also happen with rapid weight gain and loss, when the body changes too much volume in a short period of time.

* Influence of physical constitution: Many mothers will have a lot of stretch marks like their mothers and sisters; some people have very smooth belly and do not get stretch marks, this is related to physical constitution.

Etiology and pathology

The occurrence of this disease is closely related to the increased secretion of cortisol by the adrenal cortex. During pregnancy, due to the influence of large amounts of estrogen in the body, the adrenal cortex secretes more hormones. The cortisol secreted by the zona fasciculata increases by 3 times compared to non-pregnant women, and the amount of active free cortisol in the blood also increases.

Because cortisol has the function of breaking down elastin, causing its denaturation and inhibiting fibroblasts, the skin becomes fragile due to the denaturation of elastic fibers. In addition, the enlarged uterus causes the elastic fibers in the abdominal wall skin to be overstretched and break, and the enlarged breasts also undergo the same changes, ultimately leading to the appearance of striped stretch marks on the abdomen and breasts. After delivery, the stretch marks will appear over time.