Article in English: Hand-reared kittens missed the roughhousing associated with litter life and did not necessarily learn how to moderate their play attacks. These cats often grow into adults who seem to lash out viciously for no reason. Hand-reared cats that are aggressive usually give subtle signs for humans to back off. Learning these cues can prevent biting and scratching. A cat that is stressed and has no escape route is likely to lash out. Stress can come from being cornered by a noisy toddler, change in environment, or new people, so obviously it is important to be aware of your cat's emotional needs and reactions. Avoid labeling the cat as aggressive; it may simply be responding to stress. The best response is to restore calm and a settled atmosphere. Turn down noisy TVs, ask children to be quieter around the cat, and if anyone is upset, ask them to cry or shout out of the cat's hearing. If you encourage the cat to attack moving hands, feet, or fingers when playing, don't be surprised if the cat later attacks a foot, even though the game is over. The cat may assume it's still play time. A cat that is in pain or is ill can become defensive making it more likely to attack. Cats showing signs of sickness (losing weight, thirstier, vomiting) or pain (short-tempered, yowling, scratching, biting) should be checked out by a vet. It could be their bad behavior will improve once the underlying health issue is corrected. An older frailer cat that may resent being picked up or cuddled and might bite or scratch to get some peace. Ask family members to be mindful of the cat's age and need for gentler handling. Giving the cat plenty of space should help any behavior issues.

Summary in Vietnamese:
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