My hamster suddenly curled up its body and moves as if in pain
Expert Answer
Hamsters often express their state and needs through body language, which can be hard to interpret from a single gesture alone; combine it with their daily routine and health. In serious cases, take them to the vet promptly. First, a curled-up body could mean the hamster is resting or sleeping, or it could indicate discomfort.
At such times, observe whether the hamster’s breathing is even and heartbeat normal, and consider recent eating, drinking, defecation, and spirit. If all is normal, a curled body may simply mean it is sleeping soundly. However, curling up can also occur when unwell-for example, when it is cold or the room temperature is unsuitable, or when experiencing abdominal pain or internal organ abnormalities. If you notice subsequent abnormal symptoms, take it to a professional clinic for examination and treatment promptly.