Children who are allergic to milk are more likely to develop certain other health problems including allergies to other foods such as eggs soy peanuts or even beef hay fever a common reaction to pet dander dust mites grass pollen and other substances. Milk allergies milk protein allergy milk allergy symptoms often children with a milk allergy will have a slow reaction this means symptoms will develop almond milk allergies switching from regular milk to almond milk may be trading one allergic reaction for another tree soy milk . Milk or dairy allergies and lactose intolerance are not related people with a milk or dairy allergy experience symptoms because their immune system reacts as though milk and other dairy products are a dangerous invader this reaction can cause hives an upset stomach vomiting bloody stools and even anaphylactic shock a life threatening allergic response