Microscopic colitis can be one of the most common causes of chronic diarrhoea. These are characterised by normal endoscopy and abnormal colonic biopsy. There are two main subtypes of microscopic colitis: colagenous and lymfocytic one. Also similar disorders of the same symptoms can be included: Brainerd’s diarrhoea, pericryptic eosinofilic enterocolitis and colitis with minimal changes. Aetiology of microscopic colitis is not known and treatment is difficult. In differential diagnosis of diarrhoeal disorders this disease is not often considered.

        Key words: microscopic colitis – classification of microscopic colitis – diarrhoeal diseases