What is egg bound? Is there a cure or remedy?

[lindalu]

I have one of my 6 hens who for the last 3 days has just sat in the laying box, will hardly move when she comes out to eat, she eats very little and does drink some water, is she egg bound? If so what is that?
She just doesn't look well.

 

[EweSheep]

Looks like she going thru the broody stage if she does get out and eat and drink a bit and runs back in the box. If she "growls" or peck at your hand when you want to gather eggs, OR making herself two times bigger than she really is at your arrival, then no worries, she wants to set some eggs.

Right now I got a Silkie that is doing that and can not wait to get some chickies for her.