The main reasons for a hamster's death include the following:
1. Improper Diet:
Feeding too many fruits, vegetables, snacks, or human foods containing additives and flavorings may cause the hamster to have gastrointestinal discomfort, diarrhea, wet tail, and even death.
Giving hamsters raw or unclean water can lead to diarrhea and parasite infections.
Irregular feeding patterns or consuming spoiled food can also pose a threat to the hamster's health and may be fatal in severe cases.

2. Environmental Factors:
Hamsters are small animals that are sensitive to both cold and heat. Temperature changes can be deadly for them. The suitable temperature range is 20 to 28 degrees Celsius. If the temperature is too high, they are prone to heatstroke. If it's too low, they are likely to catch a cold or enter pseudo - hibernation, both of which can result in death.
Hamsters should not be placed in direct sunlight. In summer, the sun can harm their eyes and easily cause heatstroke.
Hamsters are likely to catch a cold and have a fever after getting wet in the rain, and in severe cases, it can even lead to death.
A dirty and messy living environment can also cause a hamster's death.
3. Social Behavior:
Hamsters are solitary animals with a strong sense of territory. They should be housed one per cage, and males and females should not be caged together. If kept together, they are likely to fight, bite, and may even cause death. This is especially true when there is a significant size difference between two hamsters; the smaller one may be attacked and even eaten.
4. Other Accidents:
After escaping from the cage, a hamster may get caught in a door, resulting in lower - body paralysis or a broken waist.
Hamsters may die from accidents such as being hit by a vehicle or falling from a height.
Excessive stress, such as being frightened, experiencing loneliness, or being uncomfortable in a new environment, can also cause a hamster's death.
In addition, diseases such as heart disease, liver and kidney diseases, as well as natural death due to old age, are also possible causes of a hamster's death.
To prevent a hamster's death, pet owners should pay attention to providing a proper diet, creating a suitable living environment, being mindful of the hamster's social behavior, and taking precautions against accidents and diseases.