What is the reason for the black shit?

Diarrhea is black may be caused by eating special food, taking special drugs, gastrointestinal bleeding.

1. Eating special food

itself, eating pig blood, duck blood and other animal blood products can lead to increased iron ion content in feces. When iron ions are mixed with other substances and oxidation occurs, the color of feces can turn black.

2. After taking special drugs

, bismuth ions are usually not absorbed by the body, so bismuth ions can be doped in feces and cause feces to turn black. In addition, patients who overtake ferrous sulfate tablets, ferrous succinate tablets and other drugs may also turn black due to iron ion oxidation due to incomplete absorption.

3. Patients with gastrointestinal bleeding

may suffer from esophageal cancer, gastric ulcer, gastritis, gastric cancer and other diseases due to mucosal damage. When hemoglobin in the blood undergoes oxidation reaction, feces can also turn black.