Final answer:
Lactose intolerance is a condition characterized by the inability to digest lactose in milk due to a lack of the enzyme lactase. It results in indigestion caused by dairy products and is accompanied by symptoms such as bloating, abdominal cramps, nausea, and vomiting.
Step-by-step explanation:
Lactose intolerance is a condition characterized by the inability to digest the lactose in milk, generally due to a lack of the enzyme lactase. Lactose is a disaccharide formed by the formation of a bond between glucose and galactose. In individuals with lactose intolerance, the absorptive cells of the small intestine do not produce enough lactase, which leads to indigestion caused by dairy products. Symptoms of lactose intolerance include bloating, abdominal cramps, nausea, and vomiting.