U.S. doctors online nowAsk doctors free
A member asked:

Why do some children have allergies?

3 doctor answers6 doctors weighed in
Dr. Arthur Torre
Pediatric Allergy and Asthma 52 years experience
Hereditary: The ability to have allergies is hereditary. If one parent has allergy, there is about a 40% chance of the child having allergy. If both parents are allergic, the chances increase to about 70%. Allergy also requires exposure to an "allergen", like pollen, dust mite, molds or animals. So if there is no exposure, no symptoms occur.
Dr. Douglas Tzanetos
Allergy and Immunology 20 years experience
Genes + environment: To develop an allergy, you need a genetic predisposition. For example, children at highest risk of developing allergic asthma are those whose parents have asthma. Also necessary is multiple exposures to the allergen. The strongest predictor of developing allergies in the future is having allergic disease now (for example, a child with eczema has increased chance of developing asthma).
Dr. Boyan Hadjiev
Internal Medicine 22 years experience
Exposure + Genes: One needs both a genetic component and "exposure" to a said allergen to develop an allergy. There is a growing support over the past 20 years, that growing up in an environment which is "too clean" can also lead to development of allergies down the road. Either way, allergies are on the rise.

Related questions

A 33-year-old member asked:
1 doctor answer1 doctor weighed in
A 27-year-old member asked:
2 doctor answers11 doctors weighed in
A 36-year-old member asked:
2 doctor answers4 doctors weighed in
A 35-year-old member asked:
2 doctor answers16 doctors weighed in
A 41-year-old male asked:
1 doctor answer1 doctor weighed in
Last updated Sep 28, 2016

People also asked

Connect with a U.S. board-certified doctor by text or video anytime, anywhere.
24/7 visits - just $39!
50% off with $15/month membership


Content on HealthTap (including answers) should not be used for medical advice, diagnosis, or treatment, and interactions on HealthTap do not create a doctor-patient relationship. Never disregard or delay professional medical advice in person because of anything on HealthTap. Call your doctor or 911 if you think you may have a medical emergency.