![]() This is an infectious disease that affects the large intestine, and is mostly contracted when someone eats or drinks contaminated food or water, containing Entamoeba histolytica, an intestinal parasite. Intestinal Parasitic InfectionsĪnother quite common cause is amoebiasis. Most people also show other symptoms like dehydration, weakness, nausea, and severe irritability. This is especially true in cases that are caused due to parasitic infections of the intestine or due to severe infections of other parts of the gastrointestinal tract. However, in serious cases, there can be passage of blood and mucus in stool as well. Normally, diarrhea is a condition where there is excessive passage of very watery stools. More often than not, severe diarrhea is a common cause of this condition. But if the stool appears black, then it means that the infection is of the upper gastrointestinal tract, as the hemoglobin in the blood has turned black due to oxidation, which can only occur when the blood originates from the upper gastrointestinal tract. ![]() The blood may occur as red color in the stool (melena), in which case, it is mostly indicative of an infection of the intestine. ![]() This may occur due to an infection of the intestine, or an infection in any other part of the digestive tract. The occurrence of blood and mucus in stools is an indication of a grave disease of the digestive tract, and should not be taken lightly.
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