腹泻是小儿常见的病症。值得一提的是在婴儿时期出现腹泻应注意一种乳糖不耐受的疾病。 乳糖不耐受症是由于体内缺乏一种叫乳糖酶的物质。正由于这种酶的缺乏,使人乳或牛乳中的乳糖不能消化分解,从而引起的一种非感染性的腹泻病。在新生儿或者2岁以内的婴儿发生率最高。 乳糖不耐受症一般分为原发和继发两类。原发性乳糖不耐受症属于常染色体隐性遗传,是由于先天性乳糖 Diarrhea is a common condition in children. It is worth mentioning that diarrhea in infancy should pay attention to a lactose intolerance disease. Lactose intolerance is due to the lack of a substance called lactase in the body. It is because of the lack of this enzyme, so that human milk or lactose in milk can not digest, resulting in a non-infectious diarrhea. In neonates or infants less than 2 years old the highest incidence. Lactose intolerance is generally divided into primary and secondary categories. Primary lactose intolerance belongs to autosomal recessive inheritance, due to congenital lactose