OBJECTIVE Malabsorption syndromes commonly result from a pathological interference of the normal digestive process. There have been major advances in the last 4 years. The purpose of this review is to highlight in the form of a brief summary the most outstanding information available. METHODS The review was performed based on a medical literature search using MEDLINE (1993-1997), bibliographic reviews of book chapters and review articles. As a consequence of the extensive information incorporated in the period and the limited scope of this review, the review will focus in three aspects: (1) an overview on some clinical aspects of malabsorption; (2) diseases in which predominates the disturbed mucosal phase of the digestive process, and (3) providing information on diagnostic testing regarding malabsorption. RESULTS Major advances on celiac disease, Whipple's disease, giardiasis, tropical sprue, malabsorption of oligo- and disaccharides, vitamin B12 and bile salts are discussed. New aspects on diagnostic procedures for malabsorption are also presented. CONCLUSIONS Although major advances have given a great support to the investigation of malabsorption, yet the syndrome remains a major diagnostic dilemma. Based on the limited availability of most diagnostic tests, a simple and practical diagnostic algorithm is presented.