Allergies are a common problems with many children and adults. There are many causes of allergies, but the main reason allergies occur because there is a membrane hyper permeability (leak) somewhere in the body.
Chiropractic adjustments will not cure allergies. However children with allergies are different from adults with allergies. Adults with allergies have had years to develop their problem. Children have not had this this same "abuse of their body" as adults. The nerves control the bodies ability to respond, so a foreign substance in the body "an allergy." This foreign substance compromises your immune function on a regular basis. Chiropractic adjustments will increase your bodies ability to respond to the foreign substance in an appropriate way by stimulating the nerves that control histamine response and general immune function.
All allergies are an inability of your immune system to adapt to changes in the environment. Our environment is constantly changing both the external environment and internal environment. We need to investigate both internal and external causes of your child's allergies, then correct using proven natural methods.
An example I like to use when explaining allergies to my patients is a bucket. This bucket represents your body's ability to adapt to changes in the internal and external environment. An inability of the body to respond to these changes is an "allergy." When your child's bucket is full, everything will cause an immune response or an allergic reaction. When the bucket is low, then your child's ability to adapt is greater.
The goal is to identify to the source of the allergy or immune disruptor and eliminate it, or help the body to adapt to the immune stimulant in a positive way without creating an immune 'histamine" response.