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The black line that appears along the stomach of many pregnant women is called the linea nigra, which translates from Latin as “black line.” This line typically runs vertically from the belly button down to the pubic area, though sometimes it can extend above the belly button as well. It usually becomes visible during the second trimester of pregnancy and gradually darkens as the pregnancy progresses.
The primary reason the linea nigra appears is due to hormonal changes that occur in pregnancy, especially the increase in melanin production triggered by higher levels of estrogen and progesterone.
Melanin is the pigment responsible for skin color, and during pregnancy, the body produces more of it in certain areas, including the linea alba (a faint, white line present in all humans along the midline of the abdomen). The darkening of this line forms the visible linea nigra.
Functionally, the linea nigra doesn’t have a specific biological role or benefit; it’s more of a natural side effect of the body’s hormonal shifts.
It serves as a visual marker that many women recognize as a sign of pregnancy. In some cultures, it even holds symbolic meaning or is considered a sign of fertility and motherhood.
After delivery, the linea nigra usually fades away over a few months as hormone levels return to normal, though in some women it might take longer or remain faintly visible.
It’s a harmless and common feature that illustrates how pregnancy affects the skin and body in remarkable ways.
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