Knowledge: Constant headache is a health issue and the scientific name is called hemicrania continua. On the other hand, people who cannot throw away and keep trash has Plyushkin's disorder.

Conversation:
I like to watch TV shows about hoarders. It fascinates me how some people can't throw anything away.
Yes, I guess you could consider some animals hoarders, as they accumulate food. Do you have any hoarding tendencies?
I don't think so. But is this a health issue? If so, do you know the name?

Response: Yes, it is a health issue and the name is Plyushkin's disorder.