Food allergies can result in vomiting, diarrhea, bloating, and colic in children. They can also result in skin symptoms such as atopic dermatitis , or upper respiratory tract symptoms such as nasal congestion, ear and sinus infections. In children, they lead to many sleepless nights for both the child and her parents.

Eosinophilic esophagitis is a new and disturbing condition caused by allergies affecting the gastrointestinal tract.