Black stool, abdominal distension and low fever may be caused by liver cirrhosis, intestinal tuberculosis and other diseases. 1. Cirrhosis: patients with cirrhosis have insidious manifestations in the early stage, while serious symptoms and related complications often appear in the late stage, such as circulatory disorders, splenomegaly, ascites, jaundice, endocrine disorders and so on. Due to diffuse fibrosis and pseudo lobar formation in the liver, resulting in portal hypertension, which can cause rupture and bleeding of fundic esophageal varices, gastrointestinal bleeding manifestations such as black stools, vomiting blood, and ascites, peritonitis caused by abdominal distension and low-grade fever. 2. Intestinal tuberculosis: it is a chronic specific infectious disease caused by tuberculosis bacillus invading the intestinal tract, which manifests itself as abdominal pain, change of bowel habit (such as constipation) and bowel movement (such as mushy stools), low-grade fever, malaise, night sweating (abnormal sweating after falling asleep, and stopping of sweating after waking up), etc. It can also be accompanied by weight loss, abdominal pain, and fatigue. It can also be accompanied by weight loss, abdominal pain, abdominal masses, diarrhea and other symptoms, and in severe cases, there can be intestinal obstruction, extra-intestinal fistula, and localized abscesses in the abdominal cavity. Black stool bloating low fever may also be Crohn’s disease, ulcerative colitis, intestinal tumors and other diseases caused by the suggestion of timely medical attention in order to clarify the diagnosis, under the guidance of the doctor for targeted treatment.