What is malabsorption syndrome? Malabsorption syndrome is an umbrella term used for several related medical conditions caused by a lack of the nutrients needed to help the body absorb other nutrients. They are all caused by a problem with the absorption of nutrients by the intestines. Malabsorption syndrome (MDS) is the name given to a group of conditions that occur when the body does not absorb nutrients, vitamins, and minerals, particularly vitamin B12, from food. Malabsorption syndrome is most commonly caused by deficiencies of B12, folate, and vitamin D, but can also be caused by vitamin K deficiencies. A simple blood test can detect a deficiency and correct it. B12…