• Impaired ability to absorb one or more nutrients from the intestine.
  Human Phenotype Ontology (HPO)
  The Human Phenotype Ontology Project, 2025
• Inadequate absorption of nutrients in the small intestine.
  NCI
  U.S. National Cancer Institute, 2021
• A disorder characterized by inadequate absorption of nutrients in the small intestine. Symptoms include abdominal marked discomfort, bloating and diarrhea.
  Common Terminology Criteria for Adverse Events
  U.S. National Institutes of Health, 2021
• Malabsorption is inadequate assimilation of dietary substances due to defects in digestion, absorption, or transport.
  Merck Manuals
  Merck & Co., Inc., 2025
• Malabsorption is a clinical term that encompasses defects occurring during the digestion and absorption of food nutrients by and infections of the gastrointestinal tract. The digestion or absorption of a single nutrient component may be impaired, as in lactose intolerance due to lactase deficiency.
  Medscape
  WebMD, 2025