Allergies in children are those causes pathophysiology, treatments, management, practices and management of allergies that develop in them. 40 percent of children suffer from hay fever. Children are more probable to develop allergies if one or both parents have allergies. Allergies fluctuate between grown-ups and children. Explanation for this is that the respiratory system in kids is smaller. The bronchi and bronchioles are narrower therefore even a small decrease in diameter of those airways will have profound consequences. Your child’s immune system fights infections. If your child has allergies, his/her immune system incorrectly reacts to things that are harmless. Pet dander, pollen, dust, mild spores, insect stings, food, and medications are examples of such things. Additionally, children frequently 'outgrow' their allergies. The incidence of childhood allergies has increased within the past 50 years.