The appearance of the symptoms of bloody stool and vomiting at the same time is generally an indication that a patient has an injury or illness of the gastrointestinal tract. A small amount of blood in the stool along with mild vomiting may clear up on its own, though it may also be an indication of a serious disorder. Excessively bloody stool or vomiting that does not clear up quickly can be an indication of a life-threatening condition. Some conditions that can cause the presence of these two symptoms are injuries to the gastrointestinal tract, infections, ulcers, and cancer.

In its most mild form, bloody stool and vomiting can indicate a tear in the esophagus. This condition may be caused by forceful vomiting, and the blood in the stool will usually appear dark brown and have the consistency of coffee grounds. If the vomiting persists, if there is a great deal of blood in the stool, or if there is pain, a patient with these two symptoms should see a doctor promptly.

Some potentially serious conditions can also cause bloody stool and vomiting. Infections caused by microorganisms, including E. coli or amoebas can cause both of these symptoms. In most cases, an infection of the intestinal tract will be accompanied by fever and diarrhea and should be seen by a doctor because antibacterial medications may be needed to help clear up the infection.

An injury or wound in the digestive tract can also lead to bloody stool and vomiting in a patient. An injury in any part of the digestive tract, from the mouth to the intestines can cause blood to appear in the stool. It is possible for the presence of blood to irritate the digestive tract which can lead to vomiting. Ulcers may also bleed into the digestive tract and can be responsible for bloody stool and vomiting.

Cancer and other diseases of the esophagus, stomach, or intestines can also cause bloody stool and vomiting. Diseases may present as a chronic condition that comes and goes or as an acute condition that comes on suddenly. Depending on the part of the intestinal tract that is bleeding, the blood in the stool may appear red, brown, or black. Bright red blood indicates a problem with the lower portion of the tract while dark blood that takes on the texture of coffee grounds usually indicates a problem with the stomach, esophagus, or mouth.