Health Conditions that Cause Mucus in Stool. A sudden onset of mucus in the stool, accompanied by urgent diarrhea, cramping, fever, and blood in the stool may be indicative of a bacterial infection. If you are having any of these symptoms, contact your physician immediately.
Atelectasis, or localized obstruction of the lungs that may result from mucus plug obstruction, can occur resulting to the collapse of a portion of the lungs. This is enumerated by the study published by Respiratory Care in September 2007.
This is because many times the mucus plug has some blood in it, which is called bloody show. Yours may or may not have blood in it when it comes out. Bloody show is just more of the same mucus that makes up the plug of mucus. This mucus is combined with blood from the cervix.