What are the signs and symptoms of allergic colitis?

Updated: Jan 04, 2019
  • Author: David A Piccoli, MD; Chief Editor: Carmen Cuffari, MD  more...
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Infants with allergic colitis present with blood and mucus in the stool, vomiting, and diarrhea after introduction of milk when they are aged approximately 1 week to 3 months. The symptoms may also be mild and may be indistinguishable from esophageal reflux. The syndrome is also known to occur in exclusively breastfed infants, as a reaction to food allergens present in the mother’s diet and appearing in the breast milk.

The typical presentation of milk-protein sensitivity colitis is the acute onset of blood-streaked mucoid diarrheal stool in a well-appearing infant younger than 6 months. The infants do not appear sick or dehydrated, and weight gain is typically within normal limits.

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