When the food protein is ingested, in can trigger an allergic reaction that may include a range of symptoms from mild symptoms (rashes, hives, itching, swelling, etc.) to severe symptoms (trouble breathing, wheezing, loss of consciousness, etc.).A food allergy can be potentially fatal.herefore it is advised that people with milk allergy have quick access to an epinephrine auto-injector (such as an EpiPen®, Auvi-Q™ or Adrenaclick®) at all times. To prevent a reaction, strict avoidance of cow’s milk and cow’s milk products is essential.