A 29-year-old woman has recently developed milk intolerance.
Acquired lactase deficiency is very common in GI diseases with evidence of mucosal damage. Examples include celiac and tropical sprue, viral and bacterial infections, giardiasis, cystic fibrosis, and ulcerative colitis. It is not caused by a hyper-sensitivity reaction.
celiac disease
gastrinoma
hyperthyroidism
associated with skin pigmentation
G.I.T.