Milk allergy usually occurs in infants when the milk of cow is given to them. Cow milk does not posses vitamins which we get from mother’s milk. More than 2% babies are affected by milk allergy. Milk consists of many proteins, fats, carbohydrates, minerals and vitamins. Approximately 80% of cow milk contains Casein proteins and remaining 20% contain the whey. Basically, there are two parts of milk allergy, rapid onset and slow onset. Milk allergy is out growing the most kids between the ages of 2 to 3 year. Milk allergy usually appears in early infancy. Milk allergy can affect the digestive system and other systems of body, such as skin and face.

It is important for us to know that why milk allergy occurs and what does it mean? There are many milk allergies, which occur in human being, but the most important and common form of milk allergy is Lactose (milk sugar) intolerance. This allergy occurs in the children or adult due to adverse reaction to cow, goat and sheep's milk. Lactose needs to be broken down by an enzyme, which is called lactase, to be absorbed in the children or adult’s body, but some children and adults actually do not able to produce enough quantity of lactase for this to happen. Children and adult’s digestive system cannot cope with raw lactose, so this allergy reacts against it. Whenever this allergy affects any person, the symptoms will be stomach pain, bloating, vomiting and diarrhea.

Nowadays, in most of the persons, milk proteins are the causes of milk allergy, because their stomach cannot digest it properly. Many milk proteins are very difficult for some persons to digest, like casein, which is one of the difficult milk proteins for humans to digest. The milk proteins which are difficult for human being to digest are actually crosses from the stomach wall, causing an adverse immune reaction, contributing to a host of symptoms.

Most of the people’s stomach cannot digest the wheat and the symptoms appear very slowly as compared to milk allergies. It is also very compulsory for us to note that those children or adults with a milk allergy often have allergic reactions in their bodies due to goat's and sheep's milk, although this is not always the case.