Tears or fissures of the anus lead to the production of small amounts of bright red blood in the feces. Blood stains only the outer surface of the fecal mass. The person feels pain during bowel movements. Often the disease appears in children. A drop of blood is found on toilet paper or in underwear.
Hemorrhoids next reason blood in the stool. In this case, patients may feel a hemorrhoid, and often note the allocation of dark red (venous) blood. The amount of blood may be from small to quite large.
Trauma of the rectum can lead to small bleeding. To injure the mucous membrane is possible by carrying out some diagnostic procedures (such as during a colonoscopy), as well as during anal sex. The blood stains the stool in the form of streaks and has a bright red color. Also, there is discomfort and pain during defecation. Mucosa heals in a few days after the injury, and the bleeding stops.
If a person has a polyp in the lower part of the colon, and it appeared erosion is another cause of blood in the stool. The blood has a bright red color stool in the form of streaks. Other symptoms may not be.
When inflammation of the colon (proctitis) in the stool reveals blood. It has a bright red color. Other symptoms of proctitis – severe abdominal pain, fever.
Acute intestinal neprokhodimoye – severe disease, often fatal. At the late stage of obstruction stands out blood and remnants of feces from the anus. The color and consistency of stool is reminiscent of raspberry jelly (the official term).
Colon cancer is another cause of blood in the stool. The bleeding starts in the stage of disintegration or ulceration of the cancer, so the prognosis is not very favorable. Blood has a bright red color. The amount can be significant. Patients experience other symptoms, such as pain in the abdomen, problems with a chair, weight loss.
The appearance of black stool says about bleeding from the stomach. Gastric bleeding can be a symptom of stomach ulcers or cancer.
Some infectious diseases, with the defeat of the gastrointestinal tract, lead to the appearance of blood in the stool. For example, dysentery. Patients report abdominal pain, fever, diarrhea mixed with blood. Diagnosis of the disease does not require much effort.