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Colds, Allergies, and Asthma: How Do You Tell Which Is Which?

Pediatrics Expert Advice from Shari Nethersole, M.D.

Q: How can I tell if my four-and-a-half-year-old has a cold, allergies, or asthma?

A: It can be difficult to sort these diagnoses out, particularly in the winter. Most children this age have three to six colds over the winter, with symptoms lasting one to two weeks for each cold. The symptoms of a cold usually start with a runny nose that lasts five to seven days and possibly a low-grade fever. The cough usually starts a day or two after the runny nose, and can continue for up to two weeks. Once the cold is over, however, there should be no symptoms, at least until she gets her next cold, which may only be a few weeks away.

With allergies, children usually have a runny nose that does not seem to wax and wane, as a cold does. The runny nose is more constant, with thin clear drainage. Children may have frequent sneezing as well. Some children with allergies will not have a runny nose, however, and may just have nasal stuffiness.

Asthma can be related to allergies, and while children typically wheeze as the manifestation of their asthma, some kids will only cough. If the symptoms of cough only occur with exercise, that is another warning sign that there may be some asthma. Coughing that is more prominent at night is also suggestive of asthma. The other thing to remember is that asthma is also a familial disease. If one parent or sibling in a family has asthma, eczema, or hayfever, then that child is more likely to have asthma.

If your child's symptoms do not seem to resolve completely between episodes, then I would be concerned that there is more than a cold. Talk with your child's doctor if this is true or you feel that she has signs of allergies or asthma, as effective treatments and preventive measures are readily available.

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Shari Nethersole is a physician at Children's Hospital, Boston, and an instructor in Pediatrics at Harvard Medical School. She graduated from Yale University and Harvard Medical School, and did her internship and residency at Children's Hospital, Boston. As a pediatrician, she tries to work with parents to identify and address their concerns.


Please note: This "Expert Advice" area of FamilyEducation.com should be used for general information purposes only. Advice given here is not intended to provide a basis for action in particular circumstances without consideration by a competent professional. Before using this Expert Advice area, please review our General and Medical Disclaimers.

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