COMMON COLD

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Definition

The common cold generally involves a runny nose, nasal congestion, and sneezing. You may also have a sore throat, cough, headache, or other symptoms. Over 200 viruses can cause a cold.

Alternative Names

Upper respiratory infection - viral; Cold

Causes, incidence, and risk factors

We call it the “common cold” for good reason. There are over one billion colds in the United States each year. You and your children will probably have more colds than any other type of illness. Children average three to eight colds per year. They continue getting them throughout childhood. Parents often get them from the kids. Colds are the most common reason that children miss school and parents miss work.

Children usually get colds from other children. When a new strain is introduced into a school or day care, it quickly travels through the class.

Colds can occur year-round, but they occur mostly in the winter (even in areas with mild winters). In areas where there is no winter, colds are most common during the rainy season.

When someone has a cold, their runny nose is teeming with cold viruses. Sneezing, nose-blowing, and nose-wiping spread the virus. You can catch a cold by inhaling the virus if you are sitting close to someone who sneezes, or by touching your nose, eyes, or mouth after you have touched something contaminated by the virus.

People are most contagious for the first 2 to 3 days of a cold, and usually not contagious at all by day 7 to 10.

Symptoms

The three most frequent symptoms of a cold are:

• Nasal congestion
• Runny nose
• Sneezing

Adults and older children with colds generally have a low fever or no fever. Young children, however, often run a fever around 100-102°F.

Once you have "caught" a cold, the symptoms usually begin in 2 or 3 days, though it may take a week. Typically, an irritated nose or scratchy throat is the first sign, followed within hours by sneezing and a watery nasal discharge.

Within 1 to 3 days, the nasal secretions usually become thicker and perhaps yellow or green. This is a normal part of the common cold and not a reason for antibiotics.

Depending on which virus is causing the symptoms, the virus might also cause:

• Cough
• Decreased appetite
• Headache
• Muscle aches
• Postnasal drip
• Sore throat

Still, if it is indeed a cold, the main symptoms will be in the nose.

For children with asthma, colds are the most common trigger of asthma symptoms.

Colds are commonly seen before ear infections. However, a child's eardrums are usually congested during a cold, and it's possible to have fluid buildup without a bacterial infection (caled serous otitis media).

The entire cold is usually over all by itself in about 7 days, with perhaps a few lingering symptoms (such as cough) for another week. If it lasts longer, see your doctor to rule out another problem such as a sinus infection or allergies.

Reviewer Info: Linda Vorvick, MD, Family Physician, Seattle Site Coordinator, Lecturer, Pathophysiology, MEDEX Northwest Division of Physician Assistant Studies, University of Washington School of Medicine; and David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc. , 03/06/2009