If your hamsters cage does not have enough fresh air flowing through, there could be a buildup of ammonia from your hamsters urine. The ammonia could irritate your hamsters airways and cause respiratory problems. Wire cages provide much better air flow than glass aquariums.
For example, a hamster with respiratory problems may have a thick, mucus-like discharge coming from their eyes and nose.[4] X Research source The discharge is opaque or yellow. If your hamster has a respiratory illness, its eyes and nose may also look red.
If you notice that your hamster has breathing problems (theyre breathing fast or breathing heavy), and their condition doesnt improve, see a veterinarian that is knowledgeable about small animals so that you can either rule out or diagnose the illness.

Heres something you can give your hamster to help alleviate respiratory symptoms. However this is NOT a substitute for a vet appointment as hamsters need medical assistance for respiratory issues.
Hamster Sticking Head Out of Cage. Hamsters can quickly overheat in a small, poorly ventilated cage. The first signs of heat stress are that the hamster has fast, noisy breathing or breathes through an open mouth. This is followed by a collapse where it looks like the hamster is sleeping.

This particular example perfectly highlights why Hamster Respiratory Problems Heat Stroke is so captivating.
heat stroke, is extremely serious.