1. Bloody stool
Most of them are acute (immediate) bleeding. The blood flows out of the blood vessels and is discharged in the stool through the anus within a short time, or it flows out directly after the stool. The blood flowing out looks similar to traumatic bleeding, bright red or purplish red, dark red in color, and can coagulate into blood clots after a while. Often in the following diseases:
(1) Hemorrhoids. Both external hemorrhoids and mixed hemorrhoids can cause fecal bleeding in each period, usually with fresh blood attached to the stool or blood dripping after the stool. External hemorrhoids generally have no stool bleeding.
(2) Intestinal polyps are painless stool bleeding. Bleeding during defecation, and stop after defecation, the amount varies. Generally, blood does not mix with feces, or polyps are high in position and large in number, and can also mix with feces.
(3) Rectal prolapse may have bleeding during defecation after a long illness.
(4) Anal fissure blood in the stool, the bleeding method is that there is blood on the side of the stool surface, which does not mix with the stool, and some patients drip blood after the stool.
2. Pus blood/mucus blood in stool
That is, the excreted stool contains both pus (mucus) fluid and blood. Pus (mucus) and bloody stools are often found in tumors and inflammations in the rectum or colon. The following diseases are common:
(1) The color of rectal cancer is fresher or dark red. There may be mucus in the feces, and blood, mucus and feces are often mixed.
(2) With the prolongation of the disease course, colon cancer gradually develops stool bleeding, mostly bloody stools containing pus or mucus, with darker blood.
(3) Ulcerative colitis, mucus or pus and blood in the stool, accompanied by pain in the left lower abdomen or lower abdomen.
(4) Intestinal infectious diseases such as bacillary dysentery and amoebic enteropathy.
3. Black stool
Also known as tarry stool, stool is black or brownish-black. It is one of the most common symptoms of upper gastrointestinal bleeding, commonly seen in gastric cancer or gastric and duodenal ulcers. If the amount of bleeding is small and the bleeding rate is slow, the blood stays in the intestine for a long time, and the excreted stool is black; if the amount of bleeding is large and the residence time in the intestine is short, the discharged blood is dark red; The amount of bleeding is particularly large, and it can be bright red when it is discharged quickly.
4. Occult blood in stool
A small amount (minor amount) of gastrointestinal bleeding will not cause a change in the color of the stool. It is only positive in the stool occult blood test, which is called occult blood stool. All diseases that cause gastrointestinal bleeding can cause occult blood in the stool, common ulcers, inflammations and tumors. The fecal occult blood test can detect small (trace) blood components in the stool. The early fecal occult blood of intestinal polyps (cancer) can be positive, and regular fecal occult blood testing is an important way for colorectal tumor screening (primary screening).
5. Accompanying symptoms
(1) Anal and perianal lesions have bloody stools, unbearable pain in the anus, or swelling with hemorrhoids, or anal fissures.
(2) Hematemesis in upper gastrointestinal diseases is usually accompanied by melena, and bloody stools can occur when the bleeding is large and fast.
(3) Lower gastrointestinal diseases are different according to the original disease of bleeding, and the accompanying symptoms are different.