What is milk protein allergy?

When you have a milk protein allergy and you eat or drink milk protein, your body reacts as if those proteins are trying to cause harm. It fights back by setting off an allergic reaction. A mild reaction may include a few raised, red, itchy patches of skin (called hives). A severe reaction may cause hives all over, swelling in the throat, trouble breathing, or fainting. It can also cause belly pain, nausea, vomiting, or diarrhea. This is called anaphylaxis (say "ANN-uh-fuh-LAK-suss"). It can be deadly. This is not the same thing as being lactose intolerant.

A good way to prevent an allergic reaction is to avoid the foods that cause it. Milk protein might be found in processed meats, nondairy products, and baking mixes. An allergy doctor or a dietitian may be able to help you understand which foods might be okay and what to avoid. Learn what to do if you have a reaction.