[Non-specific inflammatory bowel disease or allergic colitis in small children - what is the final diagnosis].

The reason of bleeding from alimentary tract in small children - may sometimes be a big problem and we may need a long observation before making the diagnosis. One of the most frequent reasons of bleeding is food allergy, which resembles allergic colitis. However, bleeding can be the first symptom of ulcerative colitis or Crohn's disease, but it is very rare in small children.

Helicobacter pylori infection is associated with oxidatively damaged DNA in human leukocytes and decreased level of urinary 8-oxo-7,8-dihydroguanine.

Helicobacter pylori infection is responsible for inflammation, increased production of reactive oxygen species and oxidatively damaged DNA in the gastric mucosa. There is also evidence which suggests that H.pylori infection may lead to the development of several extragastroduodenal pathologies with reactive oxygen species involvement.