A member asked:

I've had blood when i blow my nose sometimes, but i have a cold and hoarked up(from back of nose)thick mucus with streaks of blood.none since. cause?

A doctor has provided 1 answer

Common.: Cold viruses cause inflammation and fragility of vessels in your upper airway. Small streaks of blood in mucus are frequently seen in upper respiratory infections. Frank blood is much less common. Persistent symptoms warrant attention.

Answered 2/24/2018

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