The cold and the flu are both contagious illnesses with overlapping symptoms and similar treatments for symptomatic relief. However, they are caused by different viruses and can differ in severity.
The common cold can be caused by several different respiratory viruses, with rhinoviruses being the most common.. Some of the most common symptoms of a cold include sore throats, runny noses, and nasal congestion, and these symptoms can last a couple of days to a week.
Meanwhile, the flu (also known as influenza) is caused by the influenza A and influenza B viruses, and these viruses can mutate and change every year. The most common flu symptoms include fever, dry cough, muscle and joint aches, fatigue, and chills. These symptoms tend to be more severe than you might experience with a cold, and generally last less than a week to up to 10 days.