What is the reason why stool is not formed with blood

Patients show stool not formed, with blood phenomenon, mostly due to more serious enteritis, intestinal ulcer or intestinal polyps and intestinal space-occupying diseases caused by clinical manifestations, because these diseases will cause certain damage to gastric mucosa, can cause capillary rupture phenomenon, in the patient defecation can show stool not formed, with blood symptoms, need patients timely diagnosis and treatment.