01/12/2025
Let’s talk about allergies today!
1. How common are allergic diseases?
2. How to assess your baby’s risk of allergy?
3. What is “Allergy March”?
4. Can an allergy be prevented?
1. How common are allergic diseases?
Allergy problems are on the rise worldwide!
Common allergic diseases include eczema (atopic dermatitis), food allergy, allergic rhinitis, and asthma.
UK data estimated up to 40% of children have at least 1 allergic disease, while US data estimated around 27% of children have at least 1 allergic disease.
Malaysia has no overall prevalence data, but some reports have quoted that up to 62.8% of children have allergic rhinitis, 63% have some form of food allergy, 13.4% have eczema.
2. How to assess your baby’s risk of allergy?
Family history is the most important risk factor in determining if your child is at risk of any allergies.
Risk of allergic disease in children
A.Low Risk (10-20%)
If no first-degree relative (parent or sibling) with allergy disease.
B.Medium Risk (20-40%)
If one first-degree relative has an allergic disease.
Either one parent or one sibling only
C.High Risk (50-80%)
If two first-degree relatives have allergic disease.
Either both parents or a parent and a sibling
>> Please refer to the diagram below.
3. What is “Allergy March”?
To understand the relationship between different allergic diseases, we need to talk about “Allergic March”.
The allergic march refers to the natural history of allergic diseases. It is also called the atopic march. This refers to how allergic diseases progress in a person over time.
Allergies often begin early in life, first expressing themselves as eczema in young children, then progressing later to food allergies, allergic rhinitis, and asthma.
Allergy March:
Step 1:
Birth to 1 year of age: Skin irritation, such as hives or eczema
Step 2:
1-3 years of age: Food allergies (top 8 are peanut, tree, nut, cow’s milk, egg, wheat, soy, fish, and shellfish)
Step 3:
4-6 years of age: Seasonal and environmental allergies, including allergic rhinitis
Step 4:
5-7 years of age: Asthma, a chronic disease characterized by inflamed airways in the lungs
- 60% of allergies appear during the first year of life.
- The “Allergic March” shows that one allergy can progress to another allergy over time.
- About 50 percent of children with eczema eventually develop asthma, and 33 percent develop food allergies.
- Children with eczema are also at higher risk of developing allergic rhinitis.
- Food allergies in childhood are also a risk factor for allergic rhinitis and asthma.
4. Can an allergy be prevented?
Yes and No.
To a certain extent, allergic diseases can be prevented, or rather, the disease severity can be modified with appropriate strategies.
However, it cannot be completely prevented, especially in those with a strong family history of allergy.
I will share some strategies for allergy prevention in the next post based on the recently published “Malaysian Allergy Prevention 2nd Edition - Guidelines for Healthcare Professionals”.