Causes of feces with blood

The diagnostic value of the test for latent blood in terms of early diagnosis of colon cancer depends on the amount of bleeding from the tumor. On average, blood loss from tumors of the cecum and ascending colon is 9.3 ml / day (from 2 to 28 ml / day). At localizations distal to hepatic bending of the intestine, blood loss is much less and is 2 ml / day. This difference may be due to the large size of tumors of the proximal part of the colon. The blood loss from adenomatous polyp averages 1.3 ml / day, regardless of its location.

The positive reaction of feces to occult blood is possible in many diseases:

• peptic ulcer of the stomach and duodenum;
• primary and metastatic tumors of the esophagus, stomach, intestines, duodenal papilla;
• intestinal tuberculosis, nonspecific ulcerative colitis;
• invasions of helminths, traumatizing the wall of the intestine;
• expansion of the esophagus in cases of cirrhosis of the liver and thrombophlebitis of the spleen vein;
• Rundu-Osler disease in the localization of bleeding telangiectasis in any place of the mucosa of the digestive tract;
• typhoid fever (in patients with typhoid fever with positive results of reaction to latent blood in stool, macroscopic bleeding occurs much more often than with negative ones, although pronounced bleeding is possible without previous latent ones);
• getting into the digestive tract of blood from the oral cavity and larynx, with lip cracks, with an accidental or deliberate (for the purpose of simulation) sucking blood from the oral cavity and flowing it in cases of nasal bleeding;
• getting into the feces of blood from the hemorrhoids and fissures of the anus;
• getting into the stool of menstrual blood.

[1], [2], [3], [4], [5], [6], [7], [8], [9], [10], [11]