Introduction: paraneoplastic syndromes are sets of signs and symptoms affecting cancer patients, which do not depend directly on the tumor.Objective: to describe paraneoplastic syndromes associated with digestive system tumors.Methods: a search for information was carried out in the PubMed/MEDLINE and ScienceDirect databases. The search terms used were: “neoplasias gastrointestinales”, “gastrointestinal neoplasms”, “síndrome paraneoplásico”, “paraneoplastic syndrome”, “sistema digestivo”, “digestive system”, through Boolean operators. Thirty bibliographic references were reviewed.Development: in digestive neoplasms, dermatological syndromes are the most common, and include acanthosis nigricans, seborrheic dermatosis, pruritus, pityriasis ru...