What causes black stools when using the toilet?
Disease description:
This morning when I went to the bathroom, I felt something was wrong, and then I noticed my stool was black. I heard that black stool might indicate gastrointestinal bleeding or even stomach cancer, which is quite alarming. Doctor, what are the causes of having black stool when going to the bathroom?
Doctor's answer (1)
Dr. Shen Yonghua
Passing black stool may be caused by various factors.
1. Gastric ulcer or duodenal ulcer: These are the most common causes of gastrointestinal bleeding, especially in patients with a history of long-term stomach pain or indigestion.
2. Gastritis: Chronic gastritis may also lead to bleeding, particularly when there is damage to the gastric mucosa.
3. Ruptured esophageal varices: This is common in patients with liver diseases such as cirrhosis, and variceal rupture can cause massive bleeding.
4. Bismuth-containing agents: Such as colloidal bismuth pectin and potassium citrate bismuth, these medications can also cause black stools after administration.
5. Medication factors: Iron-containing hematinics or bismuth preparations can also darken stool color, although this typically does not accompany other symptoms of gastrointestinal bleeding.
6. Consumption of dark-colored foods: Such as black sesame seeds and black fungus, pigments in these foods may also affect stool color.
If black stool persists, it is recommended to seek medical attention promptly. Additionally, maintaining healthy lifestyle habits and avoiding excessive alcohol consumption and smoking can help reduce irritation to the gastrointestinal tract.
