The causes of melaena are potentially any cause of a haematemesis: oesophagitis Mallory-Weiss tear oesophageal varices peptic ulcer disease gastric neoplasms Occasionally, a distal small-intestinal bleed, such as that from a Meckel's diverticulum or a lesion of the right colon, can cause melaena. While causing dark stools, the stools in those taking iron supplementation have … Continue reading Melaena