Allergy is a systemic disorder with involvement of body parts at different ages with severity may vary or in between patient may be asymptomatic without any trouble from outside. But, inside allergy progress in the form of molecular level as TH2 cells go on increasing and Th1 cells which are responsible for immunity will be suppressed.

That's why allergy patients have repeated secondary infections and mostly are told that their immunity is low, but scientifically because of repeated exposure to aeroallergens or food allergen changes as inflammation in body continues and one fine day body parts show hyperresponsiveness showing cold, cough, skin rash or anaphylaxis or eye allergy, acidity, stomach problems, joint problems, indigestion, mouth ulcers, acne; so you name a body part, it can be involved because of the inflammatory reaction caused due to an allergy.

Allergy, immunology, autoimmune disorder have strong linking, leading the child with stomach aches or infantile eczema or atopic dermatitis to allergic rhinitis, asthma, sinusitis, COPD, chronic respiratory diseases, skin disorders, eye allergies, gastrointestinal problems, etc.