What symptoms would tell you that you have a dairy allergy?

Many: The most common symptoms of a dairy or milk allergy or GI symptoms and skin symptoms. Gi symptoms would be nausea, vomiting and diarrhea (with tiny amounts). Skin symptoms would be hives, itching, swelling, or flare of eczema. In infants, bloody stools can be seen. In infants, a rare lung reaction to milk is called heiner's syndrome. A severe milk reaction is anaphylaxis.