The color of stool is yellow and then black, which may be caused by indigestion, gastric ulcer, colon cancer, intestinal polyps, hemorrhoids and other reasons.
1. Indigestion: Normal stool is usually yellow-brown, if there is indigestion, gastrointestinal tract dysfunction can easily lead to gastrointestinal tract peristalsis slows down, easy to cause persistent stools, so the stool from the normal yellow to black, the longer the accumulation of time inside the intestines, the more the location of the position is on the upper, the more likely to be darker in color.
2. Gastric ulcer: when ulcer occurs in gastric mucosa, eating spicy and stimulating food may lead to gastrointestinal bleeding, thus leading to blood in the stool, and the oxidized stool will become black.
3. Colon cancer: clinically, the most typical manifestation of colon cancer patients in the early stage is bloody stool, and there may be pus and blood in stool, which may make the excretion of stools with normal yellowish-brown color at the front end, and sticky blackish-brown color at the back end.
4. Intestinal polyps: patients mainly manifested as intermittent blood in the stool, accompanied by mucus on the stool, the stool will also change the nature of dark brown.
5. Hemorrhoids: clinically, hemorrhoids, especially internal hemorrhoids or mixed hemorrhoids, may appear after the stool jet or blood-like bleeding, which makes the original yellowish-brown stool due to the mixing of blood and become black.
There are many reasons why the color of the stool is yellow and then black, it is best to go to the gastroenterology department of the hospital in time for gastroscopy and stool routine and other aspects of the examination, to diagnose the cause of the disease and then carry out treatment.