Brown Stripe
Posted on Friday, September 5th, 2008 at 7:22 pmWhy do pregnant women get a brown stripe down the middle of their tummy?
I have heard of this line, and although I have two children, the line was never visible on me during pregnancy.
Linea nigra (Latin for "black line") or linea negra (altered by influence of Spanish negra) is a skin pigment condition during pregnancy where a brownish streak less than a centimeter in width develops. The line runs vertically along the midline of the abdomen from the pubis to the the bottom-most part of the rib cage in the center or tip of the sternum.
It is caused by pregnancy hormones that increase production of the pigment melanin. This is also known as hyperpigmentation. Fair-skinned women show this symptom less often than women with darker pigmentation. Before it appears it may be more faintly visible as a linea alba ("white line").
Linea nigra tends to appear around the second trimester and may or may not disappear within a few months after birth. Some research suggests there may be a link between linea nigra and insulin.
There is an old wives' tale associated with linea nigra: if the linea nigra runs to the navel, it's a girl, and if it goes all the way up to the bottom of the rib cage, it's a boy.
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