Published on: 3/5/2025
Green mucus with a little blood can mean that your body is fighting an infection, such as a cold or a sinus infection. It may happen when your nasal tissues are irritated or inflamed.
When you have green nasal mucus, it may indicate that your body is fighting an infection. Your white blood cells, which help protect you from infections, release chemicals that can give your mucus a green color. Sometimes, the extra pressure from blowing your nose or swelling of the nasal tissues can cause tiny blood vessels to leak a small amount of blood into your mucus. This mix may appear during an infection of your nasal passages or sinuses. While it can be normal to see a little blood in your mucus when you are sick, if the bleeding increases or you have other worrisome symptoms (like a high fever or severe pain), it is important to talk with your doctor.
(References)
Aring AM, Chan MM. Current Concepts in Adult Acute Rhinosinusitis. Am Fam Physician. 2016 Jul 15;94(2):97-105. PMID: 27419326.
Chao TK, Liu CM, Huang WH. Significance of blood-tinged post-nasal drip in paranasal sinus disease. J Laryngol Otol. 2008 Aug;122(8):814-7. doi: 10.1017/S0022215107000394. Epub 2007 Sep 21. PMID: 17888198.
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