Did you know your cat is considered a senior once she reaches around 11 years old? Even if she still looks youthful or playful, her body is aging much faster than you might realize. A cat’s first 2 years are roughly equal to a human’s first 25, after which they age at a rate of 4 cat years per 1 human year. 

Because cats naturally hide discomfort, many age-related conditions stay unnoticed until they’re advanced. Understanding the most common senior cat health issues and the early warning signs can help you support your cat’s comfort, mobility, and quality of life as she ages.

1. Hyperthyroidism in Cats

Hyperthyroidism is now one of the most frequently diagnosed endocrine disorders in older cats. It occurs when the thyroid gland produces too much hormone, causing a fast metabolism and a wide range of symptoms that many owners mistake for “just getting older.” Because signs vary from cat to cat, hyperthyroidism often goes unnoticed until weight loss becomes dramatic.

Common signs of hyperthyroidism include:

• Sudden or unexplained weight loss
• Increased appetite (or sometimes decreased appetite)
• Excessive thirst or urination
• Vomiting or diarrhea
• Restlessness or hyperactivity
• A dull or unkempt coat

Cats with hyperthyroidism often feel better once the condition is identified and managed, which may include dietary changes or daily medication recommended by your veterinarian. 

What helps most is catching it early. Keeping an eye on your cat’s appetite, energy level, and weight at home can make subtle changes easier to spot. Regular wellness exams and annual senior bloodwork go a long way toward identifying thyroid problems before they become advanced.

2. Hearing Loss

Hearing loss in senior cats can develop gradually, which is why many owners don’t notice until the changes impact daily life. Cats who struggle to hear may become jumpy, vocalize more loudly, or seem less responsive.

Signs of hearing loss:

• Meowing louder or more frequently
• Being easily startled
• Ignoring commands or not responding to their name
• Disrupted sleep
• Increased anxiety or clinginess

If hearing loss is tied to something treatable like inflammation, mites, or infection, your veterinarian can help address it. 

For age-related hearing decline, small adjustments at home can help your cat navigate her world with confidence. Approaching gently, avoiding loud surprises, or using visual cues can help reduce anxiety. 

Keeping the ears clean and checking for discharge or odor can also help catch problems early.

3. Cat Dehydration

Senior cats often drink less while simultaneously becoming more prone to dehydration due to common age-related diseases like kidney disease, diabetes, hyperthyroidism, and gastrointestinal issues. Dehydration can quickly become serious in older cats.

Signs of dehydration include:

• Sunken eyes
• Dry or tacky gums
• Hard stools/constipation
• Reduced urination
• Lethargy or weakness
• Poor skin elasticity

Helping senior cats stay hydrated sometimes requires a little creativity. Fountains and multiple water stations can all make drinking more appealing, and moisture-rich diets may also help. Because dehydration can develop quickly, any sudden drop in appetite, energy, or litter box output is worth noting. 

4. Feline Osteoarthritis (OA)

OA is extremely common in older cats and is often mistaken for “slowing down.” Because cats rarely limp, arthritis shows up as subtle shifts in routine or mobility.

Signs of osteoarthritis include:

• Hesitating to jump
• Stiffness after resting
• Difficulty with litter boxes
• Reduced grooming
• Decreased activity
• Irritable when touched

Once osteoarthritis is diagnosed, your veterinarian can help build a plan that may include weight management, joint-supportive diets, gentle pain relief, or small adjustments around the home to make movement easier. 

Many cat owners notice improvements when they create more accessible resting spots or reduce the need for high jumps. Paying attention to small mobility changes—like hesitating before climbing—can help you intervene early and keep your cat more comfortable as she ages.

5. Feline Gingivostomatitis (FCGS)

Feline chronic gingivostomatitis is a severe and painful inflammatory condition of the mouth. Unlike typical dental disease, FCGS affects the entire oral cavity and can make eating extremely uncomfortable. Owners often first notice drooling or crying when the cat tries to eat.

Common signs of FCGS:

• Drooling or blood-tinged saliva
• Bad breath
• Crying when eating or grooming
• Pawing at the mouth
• Weight loss or avoiding food
• Red, inflamed tissues in the mouth

Because FCGS is so painful, early veterinary support is critical. Your vet may recommend a combination of pain management, oral care strategies, and other treatments focused on reducing inflammation and keeping your cat comfortable. 

Routine dental exams are one of the best tools for spotting early inflammation before it becomes overwhelming for your cat.

6. Feline Chronic Kidney Disease (CKD)

CKD is one of the most common issues facing senior cats. Because the kidneys slowly lose their ability to filter waste, many of the earliest signs are easy to overlook or confuse with normal aging.

Signs of kidney disease:

• Increased thirst and urination
• Weight loss
• Decreased appetite
• Vomiting or nausea
• Lethargy
• Dull, unkempt coat

Once CKD is diagnosed, supportive care can help your cat feel better for as long as possible. This may include hydration strategies, kidney-friendly diets, and regular check-ins to monitor how the disease is progressing. 

Keeping an eye on subtle changes like increased thirst or smaller meals can help you stay ahead of developing symptoms. Senior bloodwork done once or twice a year is often the earliest way CKD is detected.

Regenerative Medicine for Cats at Gallant

Caring for senior cats also means staying aware of new developments in veterinary medicine. At Gallant, we’re advancing research in regenerative medicine by investigating stem cell therapies for conditions that commonly affect aging cats, including feline chronic kidney disease (CKD), feline chronic gingivostomatitis (FCGS), and feline osteoarthritis (OA).

These investigational therapies are being studied under FDA oversight to better understand whether stem cells may help support inflammation control, comfort, or overall organ and tissue health. While these therapies are not yet commercially available, pet parents who want to learn more about this research or explore whether their cat may qualify for a study can reach out to a participating veterinary clinic involved in Gallant’s ongoing clinical trials.

Join Ongoing Clinical Trials for Cat Health

Explore the studies below to see what’s enrolling now and whether one may be a fit for your clinic or your pet.

Explore the Studies