Senior cat health problems: common illnesses and warning signs

Vicky Lowry

Published 30 June 2026

by Vicky Ireland

Older cat by Maria Teneva

As cats get older, their health changes and they can develop new illnesses. Some senior cat health problems are very common, but the good news is that early signs are often easy to spot. Knowing what to look for can help you get your cat the care they need sooner.

What are the most common senior cat health problems?

The most common problems in older cats are kidney disease, arthritis, thyroid problems, dental disease, and diabetes. These conditions can cause changes such as weight loss, drinking more than usual, or moving less. One of these common health problems could be the reason if your senior cat is losing weight.

What is the most common illness in older cats?

Kidney disease is the most common illness in older cats. It happens when the kidneys stop working as well as they should. It often develops slowly, so the signs can be easy to miss at first. Regular vet checks can help spot it early.

How can I tell if my senior cat is in pain?

Cats are good at hiding pain, so the signs can be easy to miss. You might notice your cat is moving more slowly or stops jumping up to places they used to reach easily. They may sleep more, eat less, or seem quiet or grumpy. Some cats also stop grooming as much, so their coat looks untidy. If your cat seems different in any way, it’s best to speak to your vet.

Can older cats develop new health problems quickly?

Yes, older cats can become unwell quite quickly. Conditions like thyroid problems or diabetes can develop fast. Even small changes like losing weight, eating more, or drinking more can be early signs. If you notice a change, it’s best to get advice sooner rather than later.

Common illnesses in older cats (and what to look for)

Kidney disease in cats

Kidney disease is a common condition where the kidneys stop working properly. Cats with kidney disease often drink more and use the litter tray more than usual. They may lose weight, feel tired, or be sick. Kidneys can wear out with age, although infections or other health problems can also play a part. If your cat is drinking more, losing weight, or seems low on energy, speak to your vet.

Arthritis in cats

Arthritis happens when joints become stiff and sore. You may notice your cat moving more slowly or having trouble jumping or climbing. Some cats become less playful or show changes in behaviour. This usually happens because joints get worn over time. If your cat is avoiding movement or seems uncomfortable, a vet can help with pain relief.

Thyroid problems in older cats

Hyperthyroidism is a condition a condition where the thyroid gland produces too much thyroid hormone. Cats with this condition often lose weight even though they are eating more than usual. They may seem restless, drink more, or be sick. It is usually caused by changes in the thyroid gland. If your cat is losing weight but still has a strong appetite, it’s important to get them checked quickly.

Dental disease in cats

Dental disease affects your cat’s teeth and gums. You may notice bad breath, sore or red gums, drooling, or trouble eating. Some cats may drop food or avoid meals. This is often caused by plaque building up on the teeth over time. If your cat seems to have mouth pain or struggles to eat, a dental check is needed.

Diabetes in cats

Diabetes affects how your cat controls sugar in their body. Common signs include drinking more, using the litter tray more often, and changes in weight. Your cat may also seem more tired than usual but still eat well. It is often linked to age, weight, and how the body uses insulin. If you notice these changes, speak to your vet as early diagnosis can help manage the condition.

Looking after your senior cat

Caring for an older cat means watching for small changes. Even simple signs can point to a problem. Regular vet checks, a healthy diet, and a calm, comfortable home can all help your cat stay well. Spotting illnesses in older cats early can help them live a longer, happier life.

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