1. If a cat's diet is too monotonous, it can lead to malnutrition and hair loss. A varied diet should be provided to ensure a balanced intake of nutrients.
2. Excessive salt intake in cats can burden their kidneys and cause hair loss. It is necessary to avoid feeding cats salty foods and keep their diet bland. 
3. If a cat has ringworm, it will cause a lot of hair loss. The cat needs to be isolated and treated with antifungal medication. If the condition is serious, seek veterinary care immediately.
4. During shedding season, cats will shed fur, which is normal. You should brush your cat's fur frequently and clean up the shed fur promptly to prevent fur buildup, which can lead to bacterial growth and affect your cat's health.
5. Frequent bathing or long-term use of human bath products can also cause cats to shed. Reduce the frequency of bathing and use specialized pet bath products.
