Can Fam Physician. 1982 Nov;28:2044-5.
Symptoms of lactase deficiency include nausea, abdominal pain, distension, bloating and diarrhea after ingesting foods which contain lactose. Lactose intolerance and bowel motility disorders have similar symptoms, and people with irritable bowel syndrome and unexplained abdominal pain may have lactose intolerance. A definite diagnosis can be made by detecting hydrogen in the breath after a lactose load, by lactase assay from a small bowel biopsy specimen or by lactose intolerance testing. Lactose intolerance is more likely in blacks, Asians and South Americans. If lactose intolerance is present without concomitant bowel motility disorder, the response to a lactose free diet is excellent.
乳糖酶缺乏症的症状包括摄入含乳糖的食物后出现恶心、腹痛、腹胀、胀气和腹泻。乳糖不耐受和肠道动力障碍具有相似的症状，而肠易激综合征和原因不明腹痛的患者可能患有乳糖不耐受。通过乳糖负荷后呼气中检测氢气、从小肠活检标本中检测乳糖酶或进行乳糖不耐受测试可以明确诊断。乳糖不耐受在黑种人、亚洲人和南美洲人中更为常见。如果乳糖不耐受而没有伴随的肠道动力障碍，无乳糖饮食的反应非常好。
