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My 2 year old hamster has a lump in her tummy. I first noticed it about 3 months ago, it grew to about the size of a ping pong ball over a week or 2 and she got very lethargic and stopped eating,then suddenly one day it disappeared completely, she felt squidgey around it almost as if it had popped, but appeared to make a full recovery and was back to her usual self for about a month but now I think it's started to grow back and she's getting lethargic again? It's all internal, no external injuries. Is she tok old too take to the vet or could they help her?