What's the difference between a cold and the flu?

While both the common cold and the flu are respiratory illnesses caused by viruses, they are distinct conditions. The flu generally feels much worse and can lead to more serious complications.

Here are the key differences:

• Onset: A cold usually develops slowly over a few days, while the flu tends to hit very suddenly.
• Severity: Cold symptoms are generally mild, such as a runny or stuffy nose, sneezing, and a mild sore throat. Flu symptoms are more intense and often include high fever, significant body aches, severe fatigue, and sometimes a dry, hacking cough.
• Fever: Fevers are common and often high with the flu. They are rare in adults with a cold, though they can sometimes occur in children.
• Duration: A cold usually runs its course in 7–10 days. The flu can last longer, and the recovery process, especially the fatigue, can take several weeks.
• Complications: The flu is more likely to lead to health issues like pneumonia, bacterial infections, or hospitalizations, particularly in vulnerable populations.

Because the symptoms can overlap significantly, it can sometimes be difficult to tell them apart without a medical test. If you are experiencing high fevers, difficulty breathing, or symptoms that are rapidly worsening, it is best to consult a healthcare provider for an accurate diagnosis and treatment plan.