Linea negra
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| Linea negra dark midline streak |
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Linea negra (Latin for "black line") also known as Linea nigra is a dark vertical line that appears on the abdomen during pregnancy. The brownish streak is usually about a centimeter in width. The line runs vertically along the midline of the abdomen from the pubis to the xiphoid process — the bottom-most part of the rib cage in the center or tip of the sternum.
It is a type of hyperpigmentation resulting from increased production of the pigment melanin thought to be caused by increased estrogen, the same process that causes the areolas to darken.[1] Why this process of hyperpigmentation occurs on the midline of the abdomen is uncertain. 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. Some research suggests there may be a link between linea nigra and insulin. Supplementing the diet with folic acid is said to reduce the discoloration. After birth, the line fades slowly, but may never disappear entirely, and sun exposure may cause it to recur.[1]
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Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
