<unk>  looks different depending on how early it enters the digestive tract—and thus how much digestive action it has been exposed to—and how much there is. The term can refer either to melena, with a black appearance, typically originating from upper gastrointestinal bleeding; or to hematochezia, with a red color, typically originating from lower gastrointestinal bleeding. Evaluation of the<unk>  found in<unk>  depends on its characteristics, in terms of color, quantity and other features, which can point to its source, however, more serious conditions can present with a mixed picture, or with the form of bleeding that is found in another section of the tract. The term<unk> " is usually only used to describe visible<unk> , and not fecal occult<unk> , which is found only after physical examination and chemical laboratory testing. In infants, the Apt test can be used to distinguish fetal hemoglobin from maternal<unk>  based on the differences in composition of fetal hemoglobin as compared to the hemoglobin found in adults.
Blood in stool
Fecal vomiting
Nipple discharge
Bloating
Rectal bleeding
Rectal discharge
Abdominal pain
Rectal pain