Hamsters running around restlessly may be due to the following five reasons:

1. Wanting to come out and play: Hamsters are energetic animals, so living in a cage for a long time will make them feel that they have lost their freedom. , thus running around in the cage. The owner can occasionally let it out to play for a few hours, or install a running wheel in the cage.

2. Estrus: Hamsters become sexually mature after more than 2 months, and may go into estrus at this time. After estrus, hamsters will become restless. Owners can breed or neuter them.

3. Heatstroke: Hamsters will be extremely excited when they first suffer from heatstroke, running around in the cage like crazy.

4. Stress reaction: The little hamster that has just arrived home is restless and running around. It is also very likely that the little hamster is not adaptable to the new environment and is nervous. Don't disturb him at this time. The situation will gradually improve in a few days.

5. Sick: Usually hamsters will become anxious when they are sick. The hamster should be sent to the pet hospital to diagnose the cause and treat it in time.