Cats are creatures of habit, and any change in their behavior can be a signal of something serious. If there is no obvious reason for a pet cat to develop a sudden change in behavior, a visit to the vet is necessary.
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Stress
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Cats do not like changes in their routine. Moving to a new home or introducing a new pet to a household can make a cat nervous and aggressive.
Pain
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If a cat suddenly becomes aggressive, there is a good chance that the animal may have an injury. Older cats may have developed arthritis.
Loss of Vision or Hearing
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Losing their hearing or eye sight can cause a cat to be come scared and fearful. This can be caused by a disease or by old age.
Tooth Problems
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Feeding a cat all canned food can cause dental problems, which can in turn cause major medical problems and pain. If a cat suddenly does not like to be picked up or becomes fearful, have the animal's teeth checked.
Hyperthyroidism
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Hyperthyroidism can cause a cat to become aggressive, nervous and hyperactive. Symptoms include increased drinking and sudden weight loss.
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