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I apologize that no one has responded to your question sooner. Different experts come online at various times. I just came online and saw your question. My name is ***** ***** I’m a biologist with a special interest in small animal health. I'm sorry to hear of this problem.
I do believe you would be wasting your money to take your hamster to a vet at this point. Since he's eating well and pooping normally, he's not suffering from a digestive issue that could be treated. In hamsters over 1 1/2 years old, serious diseases are likely causes of bloating. Congestive heart failure is one. A hamster with CHF may have difficulty breathing, may wheeze, or get tired easily. However, these symptoms don't all appear at once, but come on gradually.Kidney disease can also cause fluid retention. Hamsters with kidney problems often drink a lot and urinate a lot. A tumor or infection of the reproductive system or digestive system may also cause the abdomen to swell. None of these conditions can be effectively treated in hamsters.
Sooner or later additional symptoms will appear, but for now, your hamster is doing all right. All you need to do is continue to give him good care. I hope this information helps.
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