I used to believe that Lupus (the auto-immune disease) was actually a werewolf disease. I thought this because I saw an internet meme when I was 12 about Dr. House. One of the other doctors suggested that the patient might have Lupus, and Dr. House scoffs at the ridiculous idea and says it is not Lupus. I was a smart kid, and knew that Lupus meant wolf in Latin. So from that meme, I knew three things about Lupus:
1. It’s a disease.
2. It was so ridiculous that Dr. House scoffed at the idea of a patient having it.
3. It meant “wolf”.
Therefore, Lupus must be a werewolf disease. I thought it was a made-up disease, like a zombie virus, so when I heard of someone actually having Lupus in real life (around age 17), I thought it was a joke before realizing that Lupus must be something different than what I thought it was.
A childhood belief about being ill

others believed things like this
- I used to believe that all old people got the disease "OLD TIMERS DISEASE" Instead of alzheimers disease :D— MollyJohnson
- I used to think that Alzheimers disease was called Old Timers Disease.— Justin
- That Alzheimer's Disease was Old Timer's Disease.— Todd K
- When I was 10, I thought that nausea was called Lack-O-Candy Disease. My mom made it up— Teddybearhaha
- I thought there was a disease "Bigpox" that was like Smallpox only more horrible..— Xenomorph
- I used to believe that "Swarfega" was a disease.— Alan Brindley