What is the reason for occasional blackness?

The causes of occasional black stool include dietary factors, gastrointestinal bleeding, thrombocytopenia, etc. The specific analysis is as follows:

1. Dietary factors

Due to the large amount of iron-rich foods eaten by patients, such as pig liver, sheep kidney, pig blood, etc., excessive iron ion content in the body cannot be completely absorbed by the body, causing iron ions not absorbed to combine with sulfur oxygen and gas in the gastrointestinal tract to generate iron sulfide into feces, resulting in occasional black stool.

2. Digestive tract bleeding

Due to the large amount of gastrointestinal bleeding, ferric ions in the blood are converted into divalent iron ions through digestive juice, and are excreted together with feces, resulting in occasional black stool.

3. Thrombocytopenia

Due to the decrease in the number of platelets in patients, it will affect the coagulation function of the body, and easily induce gastrointestinal bleeding. The oozed blood can be discharged through the gastrointestinal tract, resulting in occasional black stool.