What causes milk allergies?

What causes milk allergies?

Milk allergies occur when the body’s immune system perceives one of the proteins (casein or whey) in milk as a foreign invader and launches an attack. Symptoms are usually more extreme than in lactose intolerance and include excessive mucus production resulting in a runny nose and blocked ears. More serious symptoms include eczema, colic, diarrhoea, asthma and vomiting. The milk protein casein is difficult to avoid as it is commonly used in the production of bread, processed cereals, instant soups, margarine, salad dressings, sweets and cake mix.