The two most contagious conditions?
Nausea/vomiting and head lice!
You may well get mild to medium nausea by just chatting with a sick person from the other side of the globe. It’s highly frustrating when the symptoms arrive when you hear that someone in your close proximity is sick, and you immediately feel sick yourself. How do you know that it’s just a scare?
Most of the time, if you are quite healthy, the symptoms only come when you think about it. If you are really sick, there is absolutely no way to forget it.
Or when you get a terrible itch from reading a note from school about creepy crawlers in somebody unspecified persons hair.
Why is it that these two things seems to be universally psychologically contagious? I really want to know!