Red blood in a cat's stool is a symptom of a variety of illnesses, many of which can be life-threatening. Most cases of bloody stool are the result of bacterial infections in the colon and large intestines, with more serious cases being caused by stomach cancer.
Red blood can be an indication of serious illnesses. If a cat produces stool that has red blood in it for a prolonged period of time, then it should be taken to see a veterinarian, who can run the necessary tests in order to figure out what is wrong with the cat.
It is important to try and determine what is causing the bleeding as soon as possible. This can sometimes be done without having to take the cat to a veterinarian. If a cat is constipated and having trouble defecating, then this can cause red blood to be present in the cat's stool. The best remedy for this problem is to switch the cat's diet to food that is high in fiber and water content.
If the blood is red, it is often caused by a problem in the large intestine. Inflammation of the intestinal tract can cause red blood to be present in a cat's stool and can sometimes be the result of a bacterial infection.