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Similarly, why is my cat grumpy?

If a docile cat suddenly becomes aggressive, take him to a veterinarian. Some medical conditions (e.g., hyperthyroidism) can make a cat irritable, leading to cranky behavior. Medication also can temporarily help a cat relax. Watch your cat's behavior, especially immediately before he becomes aggressive.

Furthermore, why are old cats so grumpy? Behavioral changes in cats, such as being more grumpy, start to become more obvious. Cats become more grumpy as they get older. Your cat could be feeling the effects of aging, such as soreness from arthritis, stiffness, muscular weakness, diminished hearing and smell, lethargy and lack of appetite.

Also question is, why is my cat having mood swings?

Many medical problems can cause cats to have mood swings. A cat with back pain may appear gentle and friendly until their back is touched, at which point they may react fearfully or aggressively. If your cat's mood swings can't be explained any other way, contact your veterinarian to rule out any medical problems.

Do cats get cranky when they get older?

Every new experience is a joy in itself. As they age, kittens turn into our steady and aloof companions; they are calming fixtures in our lives. With modern medicine advancing, cats are living longer. Once they age, many people describe cats' personalities as irritable, moody or just plain grumpy.