Here are some signs that your hamster might be stressed: Changes in activity: This could include both extremes - excessive pacing on their wheel, digging frantically, or becoming withdrawn and hiding more than usual. Repetitive behaviors: Examples include compulsive bar chewing, gnawing at cage furniture, or excessive grooming. Physical signs: Stress can manifest physically through fur loss, puffy cheeks, or a hunched posture. Changes in temperament: A normally friendly hamster might become irritable or even bite if stressed. If you notice any of these signs, it's important to identify the potential cause of the stress and take steps to address it.