Stool that is black in front and normal at the back may be caused by dietary factors, constipation and gastrointestinal bleeding.
1. Dietary factors: When the diet contains animal offal and blood, the above symptoms may occur due to the large amount of iron attached. It may also be caused by certain medications, such as bismuth or iron.
2. Constipation: As the excreta in the stomach and intestines cannot be discharged on time, the water in the stool will be absorbed twice by the gastrointestinal mucosa, which leads to the phenomenon that the water loss in the front part of the stool turns into black color.
3. Gastrointestinal bleeding: if the patient has gastrointestinal bleeding symptoms, when the blood in the gastrointestinal excreta is oxidized, the phenomenon of blackening in front of the stool may also occur.
The above phenomenon should go to the hospital in a timely manner, under the guidance of a professional physician for clear diagnosis and treatment.