What is the main cause of a cold?

The common cold is a viral infection that can be caused by several different types of viruses, most commonly rhinoviruses. Other viruses that can cause colds include coronaviruses, adenoviruses, and respiratory syncytial virus (RSV). These viruses are highly contagious and can spread through the air when an infected person talks, coughs, or sneezes. They can also be transmitted through close personal contact or by touching contaminated surfaces and then touching the nose, mouth, or eyes. While there is no cure for the common cold, there are measures you can take to help prevent the spread of the virus and alleviate symptoms, such as washing your hands regularly, avoiding close contact with others who are sick, and staying home when you are feeling unwell.