At one time or another, you've probably come across someone who is lactose intolerant and might experience some unpleasant gut symptoms if they have dairy. Maybe it's you — food intolerances are ...

Multiple food allergies (MFA) means being allergic to more than three foods. Cross-reactivity can raise risk because similar proteins trigger the same immune response. Symptoms can include hives, ...

An allergy is an immune system overreaction to a substance that would otherwise pose no harm. Doctors may use a physical examination, skin tests, and blood tests to diagnose allergies. Different types ...