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Mucus Plug

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Updated July 01, 2014

Mucus Plug - Amniotic Sac Ruptured

A look at the mucus plug.

Photo © A.D.A.M.

Definition: The plug of mucus that fills the cervix to protect against disease and infection. This may start leaking out as the cervix slowly starts opening before labor, or may come out in one big chunk. It can be pink or tinged with blood.

Also Known As: Bloody Show

Alternate Spellings: mucous plug

Examples: I started losing my mucus plug about a week before my baby was born.

See a photo of a mucus plug.

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