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You're through to Dr. Edele, a UK vet.
Sorry to hear Lilith isn't feeling well.
Is Lilith breathing normally?
What does it smell like?
Ok, thank you.
There are a couple of things that could cause this. The yellow-brown color is concerning as it sounds like it could be stomach contents. Rat's can't vomit like us because they have a really strong sphincter at the top of their stomach so if she is bringing up that fluid there is a blockage in her stomach. Lilith should see your vet as an emergency today.
You're welcome. I hope Lilith is feeling better soon.