If your child constantly has a runny nose and always seems to have a cold, don't be too quick to dismiss their symptoms. They may have allergies. Allergies are also inherited. Allergies are an inappropriate immune system reaction to substances that aren't usually harmful.
Allergens are the substances that can trigger an allergic reaction.
Parents can help in identifying their child's allergy problems in various ways. Before you visit your doctor, write down observations about your child's condition and reaction to suspect allergens. Keep a diary. Often reactions to allergens may not occur right away, but several hours after your child has been in contact with the allergen. If parents note what their child was doing a few hours previous to the reaction, they can better help to pinpoint the allergen.