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7. Ulcers

Ulcers are small internal sores that develop in the stomach, small intestine, or esophagus. When an ulcer becomes irritated or bursts, it can cause internal bleeding. When this occurs in the digestive tract, the blood that passes through the small intestine and mixes with feces can make subsequent bowel movements black.

Black Stool: A Comprehensive Guide to Causes and Treatments
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Disclaimer

This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.