What is the reason for the dark blue stool

Blue-black stool is a manifestation of abnormal stool. For friends who have blue-black stool, they really want to know the cause of the blue-black stool. So what is the cause of blue-black stool? Next, this article will introduce you to the relevant content about what causes blue-black stools, for your reference only. Friends who want to know what causes blue-black stools can take a look.

What causes blue-black stool? If you have not eaten pig blood and have not taken any medicine that may cause blue-black stools, blue-black stools are usually caused by upper gastrointestinal bleeding. When the stomach and duodenum bleed, the blood undergoes various chemical changes as it passes through several meters of intestine and gradually turns bluish-black. Therefore, if the bleeding in these places is not large in amount, the stool should be bluish-black. Among patients with upper gastrointestinal bleeding, about half suffer from bleeding due to ulcer disease, most of which are duodenal ulcer bleeding. In addition to ulcer disease, gastritis, cirrhosis combined with ruptured esophageal or gastric varicose veins, and gastric cancer are also common causes of upper gastrointestinal bleeding.

Experts say that the color, texture, and shape of stool are the best indicators of a person's physical health. Black stool, dry stool, watery stool, and fine stool are all reflections of disease. Many patients think that black stools are nothing to worry about, and that it is mostly related to diet. They often ignore the existence of intestinal lesions and delay the best time to treat the disease.

In fact, blue-black stool is a manifestation of gastrointestinal disease. When the upper gastrointestinal tract such as the esophagus, stomach, duodenum, upper jejunum, pancreas and bile duct bleeds, the iron in hemoglobin in red blood cells combines with sulfide to form iron sulfide under the action of intestinal bacteria, making the stool black.

However, it is important to note that tarry black stools are only a typical manifestation of upper gastrointestinal bleeding. The stool color changes during upper gastrointestinal bleeding are not always tarry, but vary greatly. For example: when the amount of bleeding is relatively small, the change in stool color cannot be detected by the naked eye and can only be detected through special tests; when the amount of bleeding reaches more than 50 ml, the stool color becomes darker, which can be seen by the naked eye. However, in addition to the tarry stools mentioned above, the color of the stools can also turn into brown, reddish brown or even bright red when there is upper gastrointestinal bleeding.

The above is an introduction to what causes blue-black stools. I believe that after reading the above introduction, you already know what causes blue-black stools. From the above introduction, we can see that if the blue-black stool is not caused by diet, then upper gastrointestinal bleeding is likely to be the culprit causing the blue-black stool. Therefore, everyone must go to the hospital for treatment in time!