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Why Do Dialysis Patients Have Black Stool

Why Do Dialysis Patients Have Black StoolSome patients on dialysis may find that their stool is black. The black stool can reveal some underlying disorders for kidney patients. The question is why dialysis patients have black stool. Please read through the article and find the answer.

1. Why do dialysis patients have black stool?

Generally speaking, black stool can be caused by the following conditions:

Gastrointestinal bleeding

Black stool is a typical sign of gastrointestinal bleeding. After oxidation, stool will become black. This condition has a close relation with buildup of toxins and malnutrition. Because dialysis cannot discharge toxins adequately, toxins will cause pathological changes of mucous membrane easily. Malnutrition can reduce the protection mechanism and repairing ability of gastric mucosa. Thus, dialysis patients are at a risk of gastrointestinal bleeding, causing black stool.

Side effects of medicines

Black stool can be a side effect of medicines if the medicine contain bismuth.


Constipation is a common complication of kidney failure due to limited fluid intake and restricted diet plan. The stool color will tend to become black due to constipation.

2. How to treat black stool in dialysis patients?

Diet management

A low-fiber diet is one of the most common causes of constipation in renal patients. So getting enough fiber on a renal diet is helpful for relieving constipation. Renal-friendly fruits include raspberries, blackberries, pears, apple, strawberries and blueberries. Renal friendly vegetable choices are cooked corn, carrots, green beans, yellow beans and broccoli.

Choose alternative therapy to dialysis

Although dialysis can replace damaged kidneys to filter blood, it is not effective. In order to relieve black stool, patients can choose some alternative remedies to purify blood.

-Blood Purification consists of various methods including Plasma Exchange, Immune absorption, Hemofiltration, CRRT and so on. These methods can not only remove small molecular substances but also discharge middle and large molecular substances from the body so as to set up a good internal environment for kidney restoration.

-Improve renal function: The radical solution for black stool is to improve renal function. In this case, Micro-Chinese Medicine Osmotherapy is worth a try. It is proven that the active ingredients in Chinese medicines can repair impaired kidneys and improve renal function through expanding blood vessels, preventing inflammation and coagulation, degrading extracellular matrix and providing necessary nutrients for damaged kidneys.

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Tag: Kidney Failure Symptoms Dialysis

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