Red stools may be caused by dietary factors, but also ulcerative colitis, hemorrhoids and other disease factors. 1. Dietary factors: eating red food, such as red dragon fruit, the body is not fully digested to break down the pigment, along with the feces out of the body will appear after the stool becomes red. 2. Ulcerative colitis: active ulcerative colitis patients may appear mucus, pus and blood, resulting in red stools, in addition to diarrhea, abdominal pain and other symptoms. 3. hemorrhoids: hemorrhoid patients if the hemorrhoidal core venous rupture can lead to bleeding, followed by the symptoms of red stools, but also with the anus dripping blood, blood on the paper, etc.. After the emergence of red-like stools to exclude dietary factors, it is recommended to go to the hospital, ask the doctor to make a judgment, clear the cause of the disease, so as not to delay the condition.