Malabsorption is when the body has trouble absorbing certain vitamins, minerals, carbohydrates, proteins, or fats even though food is digested.

The Intestines

Copyright © Nucleus Medical Media, Inc.


Malabsorption is associated with a number of diseases that affect the intestines or other areas of the gastrointestinal tract, such as:

  • Lactose intolerance
  • Celiac disease
  • Intestinal parasites
  • HIV/AIDS, cancer, or treatment for those conditions
  • Whipple disease or other bacterial infections
  • Crohn's disease
  • Cystic fibrosis
  • Inadequate digestion due to:     
  • Bacterial overgrowth syndrome
  • Gastric resection—removal of all or part of the stomach
  • Inadequate function of the pancreas
  • Excessive production of gastric acid
  • Short bowel syndrome or previous bowel removal
  • Liver disease
  • Risk Factors

    Factors that may increase your chance of malabsorption include:

  • Medical conditions affecting the intestine, such as celiac disease, cystic fibrosis, or Crohn's disease
  • Use of laxatives
  • Excessive use of antibiotics
  • Intestinal surgery
  • Alcohol use disorder
  • Travel to countries with high incidence of intestinal parasites
  • Symptoms

    Malabsorption may cause:

  • Weight loss
  • Abdominal distention and bloating
  • Diarrhea
  • Flatulence
  • Bulky, foul-smelling stools
  • Weakness and fatigue
  • Swelling or fluid retention
  • Muscle weakness
  • Diagnosis

    You will be asked about your symptoms and medical history. A physical exam will be done.

    Your bodily fluids, waste products, and tissues may be tested. This can be done with:

  • Blood tests
  • Stool tests
  • Urine tests
  • Hydrogen breath test
  • Small bowel biopsy
  • Images may be taken of your bodily structures. This can be done with x-rays.

    Your pancreas may be tested. This can be done with a pancreatic function test.


    In some people, the specific underlying condition must be treated in order to reverse the malabsorption. Other conditions cannot always be treated such as cystic fibrosis, short bowel, or pancreatic insufficiency.

    Depending on the cause and severity of the malabsorption, you may need to make up for nutritional deficiencies by consuming additional nutrients through foods or supplements. A diet rich in vitamins and minerals along with increased quantities of fat, protein, or carbohydrate may be required. Nutrient supplementation may include folate, iron, and vitamin B12. In some cases, nutrients may be given by IV.


    Conditions that cause malabsorption need to be recognized and managed. Work with your doctor and follow the recommended treatment plan to decrease malabsorption complications.