乳糖吸收不良症系指由于小肠粘膜乳糖酶缺乏,使乳糖的消化吸收障碍引起的以腹痛、腹胀、腹泻为主的临床症群。口服的乳糖在小肠不能被分解吸收,进入结肠后经细菌作用产生乳酸和短链脂肪酸,刺激结肠粘膜使肠蠕动增强,加之未被吸收的糖使肠腔内渗透压增高,引起上述症状。 Lactose malabsorption refers to the clinical syndrome due to abdominal pain, abdominal distension and diarrhea caused by the digestive and malabsorption of lactose caused by lack of lactase in small intestinal mucosa. Oral lactose in the small intestine can not be decomposed and absorbed into the colon by bacteria produce lactic acid and short-chain fatty acids to stimulate the colonic mucosa so that peristalsis increased, combined with unabsorbed sugar so that intestinal osmotic pressure increased, causing the above symptoms.