Dry and black stool can be caused by constipation, diet, drugs and diseases, etc. Patients need to pay attention to this, and can go to the hospital to improve the stool occult blood test, gastroscopy and other related tests, and then take corresponding treatment or care measures to improve the symptoms. Common causes and treatments a. Constipation: If the stool is in the intestine for a long time, the intestinal wall can absorb water, bacterial decomposition of bilirubin and lead to dry stool, and the color can gradually become darker and darker from green. Patients need to ensure the body’s daily water intake to avoid dry stools, but also under the guidance of professional doctors, the use of lactulose and other drugs to promote bowel movements. Second, diet or drugs: If you eat foods with high iron content such as duck blood and pig liver, and drink too little water, the intestines can not absorb too much iron, resulting in dry, black stools. If oral iron, activated charcoal and other drugs, can also lead to dark and dry stools, usually stop eating similar drugs or food, the symptoms can be relieved. Third, the disease: 1, gastric ulcer: H. pylori long-term infection, stimulating the gastric mucosa, resulting in mucosal breakdown, causing bleeding in the upper gastrointestinal tract, resulting in black stools, can apply drugs such as omeprazole to inhibit gastric acid secretion and protect the gastric mucosa, but also need to apply quadruple therapy to completely eradicate H. pylori infection; 2, cirrhosis: abnormal liver function, easily lead to reduced synthesis of coagulation factors, which leads to coagulation dysfunction, causing diffuse bleeding of the mucosa of the entire digestive tract, which eventually leads to the formation of black stools. Treatment should pay attention to rest, can apply antiviral drugs; 3, other: leukemia, hemophilia and other blood system diseases, as well as sepsis, typhoid and other systemic diseases can also cause the corresponding symptoms. Gastroscopy, fecal occult blood test or bone marrow aspiration can be completed at the hospital to clarify the diagnosis and then treat according to the specific cause.