What causes yellow snot?

Answer by  whoareyou (3483)

Yellow snot is a definite sign of infection. This could mean anything from just a 'common cold', to a serious sinus infection, to a cold or illness even more serious. If it continues longer then a few days, seriously consider seeing a health care physician.

Answer by  Kris (797)

You may produce some yellow snot first thing in the morning from mucus that has been sitting in your sinuses overnight. Infection could cause additional yellow snot to occur.

Answer by  Jennifer46 (29)

Usually when boogers or snot is yellow this is caused by an infection. When you are sick with a cold is when you're suseptible to most infections. Sometime is is the infection that has made you sick. Your snot can also be green or brown. When this happens it is best to visit the doctor.

Answer by  et (154)

A few factors can cause yellow snot. The most common being an infection that links to the sinus cavity in the body. Clear snot means no infection. Also, if you are in a smoky environment, or a toxic environment, that could also cause you to have yellow snot. It's not good if you do, though!

Answer by  Anonymous

it sucks I've had it for four days, the worst cold