The common cold and influenza are both viruses that affect the respiratory system. Their symptoms can be similar, and it is often difficult to tell whether you have a cold or the flu. In some cases, your doctor may want do a test to see whether you have the flu, and if so, which type.
Symptoms
The common cold usually produces a runny or stuffy nose, sneezing, sore throat and productive cough. Influenza symptoms, according to the Centers for Disease Control, may include a fever, chills, body aches, extreme fatigue and a dry cough.
Time Frame
While a cold comes on gradually, over a period of several days, the flu often comes on very quickly. It is not uncommon to have flu symptoms come on suddenly over a period of three to six hours. According to Dr. Alan Greene, a cold will usually subside in about a week. The flu's major symptoms will also decrease in a week, but a cough and fatigue may persist for several weeks.
Severity
In general, the flu is more severe than the common cold. The symptoms are more intense, and the possible complications are more serious, according to the Centers for Disease Control.
Prevention
Both a cold and the flu can be prevented by practicing good hygiene, such as washing hands frequently and covering your sneezes and coughs. You may also have a flu vaccine each year to prevent influenza.
Complications
The common cold has no serious complications in otherwise healthy people. Influenza, however, can lead to bronchitis, pneumonia, croup or ear infection, according to Dr. Greene.
