There's blood in the stool. What's going on?

The main reasons for blood in stool are as follows: First, hemorrhoids. This is one of the most common reasons, especially internal hemorrhoids easily cause blood in stool. Hematochezia caused by internal hemorrhoids, generally not pain, only in the hemorrhoids out of the anus, will show severe anal pain symptoms. Second, anal fissure. Hematochezia caused by anal fissure and hemorrhoids are not the same, anal fissure not only causes blood in stool, but also has the characteristics of severe pain around the anus. Especially in the stool, the pain is intense. This pain generally lasts for a few minutes before it can be alleviated. Third, all kinds of enteritis. Inflammation will destroy the integrity of the intestinal mucosa, resulting in dark purple blood and secretions mixed in the stool.