How do I tell if my hens have worms?

[ECrow]

Recently I’ve been noticing some unusual poop in my coop. It’s runny and yellow/green and a few of my hens bottoms have been getting dirty. One of my hens has completely stopped laying and her face is looking a bit pale. Is it possible that she has worms? How do you tell if that is the issues? Should I be treating them for worms regularly or is that a thing I should do only when I know for sure that they have them? My run and coop is mostly dirt floor and straw, and it gets a little muddy sometimes when it rains or if they knock their water over, and I’ve read that that can lead to worms. Only one of my four adult hens is laying, (one I mentioned above, the other two are molting and caring for chicks) but I’ve been avoiding eating their eggs since I don’t know what the problem is.
If anyone has help I’d be very grateful! If needed I can try to get photos of my hens or their poop.

 

[azygous]

It's a good bet they have worms, but you can find out with a simple inexpensive fecal float test from your vet.

If you have a vet that sees other pets of yours, gather a random sample from the flock and take it to your vet and request a fecal float test for parasites. You will find out if worms are present and what kind. That will allow you to choose the correct wormer to target those species of worms.

It will also tell you if coccidia are present in larger numbers.

It's not often we get a simple, cheap test to tell us exactly what's going on.