However, passing mucus in the stool, especially if it is a new symptom, should still be mentioned to a physician at the next office visit. Mucus without an underlying cause, such as one of the pre-existing conditions mentioned above, is a change in bowel habits and should be reported to a physician immediately.
Coughing up blood. Coughing up blood is the spitting up of blood or bloody mucus from the lungs and throat (respiratory tract). Hemoptysis is the medical term for coughing up blood from the respiratory tract. Considerations. Coughing up blood is not the same as bleeding from the mouth, throat, or gastrointestinal tract.
If you notice an increase in stool mucus that occurs regularly, or is accompanied by bleeding or a change in bowel habits, contact your doctor, the Mayo Clinic advises. That's because larger amounts of mucus associated with diarrhea may be caused by intestinal infections that require medical attention. Also seek medical attention for bloody mucus in your stool, or mucus accompanied by abdominal pain.