What if hamster's cheek is swollen?

The bulging cheeks indicate that it has stuffed some food into the pouch. This is the hamster's nature, so don't worry. But if its cheeks are red, it is inflamed! You can push its little cheek to show that there is too much in its mouth, and then it will spit it out by itself. Or you can help it yourself, pick it up, put a cotton swab in its mouth and cheeks, and take it out when you touch anything. But hamsters will be very uncomfortable, and this method will only work if you are familiar with it. But maybe it will be 4!

I suggest you go to the pet hospital to see SS immediately.