Sneezing, scratchy throat, runny nose -- everyone knows the first signs of a cold, probably the most common illness known. These symptoms are usually caused by a viral infection. Although the common cold is usually mild, with symptoms lasting 1 to 2 weeks, it is a leading cause of doctor visits and missed days from school and work. According to the CDC, 22 million school days are lost annually in the United States because of the common cold.
In the course of a year, people in the U.S. suffer 1 billion colds, according to some estimates.
It's every mother's mantra: Cover your mouth when you cough. During flu season, it's the best advice you can give any child -- or adult - who wants to avoid the flu.
The flu virus is passed from one person to the other through fluids from mouth and nose secretions. When we cough and sneeze, those droplets go into the air.
"It's our responsibility to cover mouth and nose so those droplets don't go into the air... so they don't spread to other people," says James Mamary, MD, a pulmonologist with...
Children have about 6 to 10 colds a year. One important reason why colds are so common in children is because they are often in close contact with each other in daycare centers and schools. In families with children in school, the number of colds per child can be as high as 12 a year. Adults average about 2 to 4 colds a year, although the range varies widely. Women, especially those aged 20 to 30 years, have more colds than men, possibly because of their closer contact with children. On average, people older than age 60 have fewer than one cold a year.
In the U.S., most colds occur during the fall and winter. Beginning in late August or early September, the rate of colds increases slowly for a few weeks and remains high until March or April, when it declines. The seasonal variation may relate to the opening of schools and to cold weather, which prompt people to spend more time indoors and increase the chances that viruses will spread to you from someone else.
Seasonal changes in relative humidity also may affect the prevalence of colds. The most common cold-causing viruses survive better when humidity is low—the colder months of the year. Cold weather also may make the inside lining of your nose drier and more vulnerable to viral infection.