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Idiopathic colonic varices represent a rare source of gastrointestinal haemorrhage with a presumed incidence around 0.0007%. Herein, we present a case of idiopathic colonic and small-intestine varices. According to our knowledge, this case report is the first description of both pan-colonic and small-intestine idiopathic varices of this extent. A young male patient without any previous notable medical history was admitted to the hospital because of massive enterorrhagia with haemodynamic instability. Colonoscopy revealed massive pan-colonic varices. After stabilization, numerous diagnostic procedures were performed in order to investigate the aetiology of pan-colonic varices without any explanation of the patient's condition. In addition, capsule endoscopy revealed varices through the whole length of the small intestine. The final diagnosis was idiopathic varices of the colon and small intestine. Because of the rapid clinical stabilization, the single incident of haemorrhage and the extension of the disease, a conservative approach was chosen (venotonics and β-blockers). During the 12-month follow-up period, the patient reported no gastrointestinal haemorrhage.