system
Given the following post, respond as if you're commenting on Reddit:
human
What does "catching a cold" mean biologically?

Is it only due to temperature difference? What are the physiological reactions taking place?

Is it due to an infection? If yes, which organisms and what the temperature has to do with it?
gpt
It's an infection by one of a couple of hundred viruses, often one of those called a rhinovirus from the Greek for "nose", that lodge in the nose and throat. The irritation it causes results in swelling, causing the blocked nose sensation, mucus production and a cough as the body tries to rid itself of the source of irritation. One of the automatic responses to infection is to increase body temperature as usually the organisms are more sensitive to higher temperatures than the rest of our body.