[Bloody diarrhoea - causes, diagnostics and therapy].

Bloody diarrhoea is always a warning sign and should prompt a more thorough history on duration and accompanying symptoms as well as current medications (antibiotics, NSAR) and diseases (HIV, IBD, transplant organ recipients). In this review the most common bacterial, viral and parasitical causes of bloody diarrhoea as well as radiation and ischemic colitis will be discussed. Additionally important diagnostic tools such as stool cultures and calprotectin for infectious causes auf diarrhoea and imaging tools (CT and endoscopy) for ischemic disease are presented. The causes of bloody diarroea in immunosuppressed patients and IBD are additionally addressed.