The presence of black sludge on the wiping paper after defecation is generally categorized into physiological and pathological factors. Physiological factors such as iron intake after black stool is normal, pathological factors such as upper gastrointestinal bleeding (such as peptic ulcer) is abnormal.
1. Physiological factors: If you find black residual material in the stool, it may be caused by diet, such as the intake of iron-rich food (such as duck blood, pig blood, etc.); in addition, taking iron-containing drugs (such as ferrous sulfate). This is due to the combination of iron and hydrogen sulfide in the intestines, the formation of black iron sulfide, which is a normal phenomenon.
2. Upper gastrointestinal bleeding: such as peptic ulcer, caused by gastric mucous membrane damage caused by bleeding, iron in the blood will also be in the intestinal tract chemical reaction, so there will also be black stool.
To be on the safe side, it is recommended to go to the hospital for examination to exclude gastrointestinal diseases. If it is caused by gastrointestinal diseases, it is recommended that regular treatment be carried out under the guidance of a doctor.