allergy in children's are common is because of immune system which is hypersensitive to certain things in the atmosphere or in the food that he/she consumes , so here the immune system is identifying some protein either which is in the atmosphere like what you in hail or what comes in contact with the skins or what is consumes in food , these proteins are often identified as a bacteria or virus, the immune cell called as mars cells they suppose to release histamine whenever they comes in contact with bacteria or viruses , but in allergies this histamine is released unnecessarily even if the patient immune system comes in contact with any other protein which is actually not to be reacted against, so the immune system has a wrong identification that some thing else is a bacteria and the histamine is suppose to kill bacteria and viruses is released in the blood stream even if the patient blood stream there the immune system come in contact with any of this allergies.

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