A member asked:

What is the crud when you clear your throat out?

A doctor has provided 1 answer

Secretions: This may be some post-nasal drip from sinus drainage, or simply the body's way of getting unwanted materials out of the upper respiratory tract. Your tissues have a brush border and secrete mucous to entrap foreign particles and sweep them out so that they don't get into the lungs and cause pneumonia.

Answered 7/21/2012

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