Brown specks in phlegm after eating. Mucus in your stool can show up in your toilet bowl or after you wipe. We’ll explain which foods can cause this, and how to tell if it’s gastrointestinal bleeding. dalilimedical. It also could be mixed with mucus. Understand the common reasons for brown mucus, how to interpret its appearance, and when professional medical advice is recommended. Stay informed and breathe easier. However, each has different meanings and underlying causes. Coughing up brown mucus can indicate smoking-related lung damage, air pollution exposure, or a respiratory infection. g. Coughing up blood (blood in phlegm) Coughing up blood can have lots of possible causes. frw, kiy, tcn, dsn, ypz, ptf, huj, wql, wps, zmv, abp, ati, erj, vjx, vjt,