Common Cat Ailments: A Guide for Australian Pet Owners

Cats are good at hiding illness. Most of their health problems arrive without a clear label: a bit of sneezing that could be nothing or the start of a contagious infection, a few drops of urine outside the tray that could be stress or a blockage. The good news is that the common ailments Australian owners run into are well understood, and most respond well when they are caught early. This guide covers what those problems tend to look like at home, and the moments when waiting is the wrong call. The aim is simple: notice early, act calmly, and let your vet do the diagnosing.

First: the signs that need urgent veterinary care

Some problems cannot safely be watched overnight. Seek urgent veterinary help if you notice any of the following:

• Straining to urinate, crying in the litter tray, producing only drops, or no urine at all (especially in male cats). A urethral obstruction is a medical emergency.
• Laboured breathing, open-mouth breathing, or severe lethargy.
• Repeated vomiting with an inability to keep water down, or vomiting with marked weakness.
• Sudden collapse, seizures, or severe pain.

Urinary blockage is the clearest do-not-wait situation in cats. When the urethra is blocked, toxins and electrolyte imbalances build rapidly, and the cat can deteriorate quickly without treatment.¹

Common respiratory infections (cat flu)

What it is

Upper respiratory infections are common in cats, especially where they mix closely in boarding, shelters, or multi-cat homes. The usual culprits are viruses such as feline herpesvirus (FHV-1) and feline calicivirus (FCV). Vaccination reduces the risk of severe disease, but it does not guarantee a cat will avoid infection or mild signs altogether.²

What you might see at home

• Sneezing, nasal discharge, watery eyes
• Conjunctivitis (red, sore eyes)
• Coughing (less common) and a hoarse meow
• Reduced appetite, often because a blocked nose dulls the sense of smell

When to see the vet

Book in promptly if your cat is not eating, seems dull, has thick or discoloured discharge, has eye pain, or shows any breathing effort. Kittens, seniors, and cats with chronic illness can slide downhill faster.

Prevention and treatment

Your vet may recommend supportive care such as fluids, nutrition support, and eye medication, and sometimes antibiotics if a secondary bacterial infection is suspected. Keeping vaccinations up to date helps reduce disease severity and spread in the wider cat community.²

Feline obesity

Why it happens

Obesity builds quietly: slightly too much food, too few chances to hunt and play, and long indoor days that ask little of a cat's muscles. Neutering, ageing, and free-feeding can all tip the balance.

Why it matters

Extra weight is linked with significant health problems, including diabetes and joint disease, and it makes grooming and heat regulation harder for the cat.³

Practical ways to prevent weight gain

• Measure meals rather than topping up a bowl all day.
• Use food puzzles or scatter feeding to slow eating and add activity.
• Build short play bursts into the day with wand toys and chase games, especially for indoor cats.
• Ask your vet to score your cat's body condition and set a realistic target weight.

If weight loss is needed, do it with a vet-guided plan. Rapid weight loss can be dangerous for cats.

Dental disease

What is common

Dental disease often progresses under the radar. Plaque and gum inflammation can lead to periodontal disease, and many cats also develop painful tooth resorption.

Clues you can notice

• Bad breath that is new or worsening
• Drooling, dropping food, or chewing on one side
• Pawing at the mouth or reluctance to eat hard food
• Weight loss or hiding, since dental pain can be subtle

Prevention and treatment

Tooth brushing is the gold standard for home care, and even occasional brushing is better than none. Your vet can assess whether a professional dental clean under anaesthetic is needed, and whether any teeth should be extracted.⁴

Parasites: fleas, mites, ticks, and worms

What they do

Fleas are more than an itch. Some cats develop intense allergic skin disease from flea saliva, and fleas can also play a role in tapeworm transmission. Ear mites and intestinal worms are common too, particularly in kittens and cats that hunt.

Signs to watch for

• Scratching, scabs around the neck and rump, hair loss
• Dark flea dirt in the coat
• Head shaking or dark debris in the ears (possible ear mites)
• Diarrhoea, a pot-belly in kittens, or poor condition (possible intestinal worms)

Prevention and treatment

Use a regular parasite-control plan matched to your cat's lifestyle and local risks. Your vet can advise on safe products and timing, especially for kittens and pregnant cats. Never use dog-only flea products on cats, as some are toxic to them.⁵

Urinary tract issues (FLUTD, cystitis, stones, blockage)

What FLUTD actually means

Feline lower urinary tract disease (FLUTD) is a broad label for conditions affecting the bladder and urethra. Causes include idiopathic cystitis (inflammation with no single clear cause), crystals or stones, and, most urgent of all, urethral obstruction.^{1, 6}

Signs that suggest a urinary problem

• Frequent trips to the tray, passing small amounts
• Straining, crying, or licking the genitals
• Blood in the urine
• Urinating outside the tray

When it is an emergency

If your cat is straining and producing little or no urine, treat it as urgent, especially in male cats, who are at higher risk of obstruction. A complete blockage is life-threatening without rapid veterinary treatment.¹

Reducing risk

Good hydration helps. Many cats drink more readily from multiple bowls, water fountains, or by eating more wet food. Stress reduction and stable routines can also matter, particularly for idiopathic cystitis cases.⁶

Skin conditions (allergy, ringworm, mange)

What is common

Skin disease in cats often looks similar at first: itch, redness, scabs, hair loss. Flea allergy is a frequent driver, but fungal infection (ringworm), mites, and food or environmental allergies can all be involved.

What you might notice

• Overgrooming, thinning coat, bald patches
• Small scabs, often along the back
• Red ears or face rubbing
• Circular patches of hair loss (possible ringworm)

Why diagnosis matters

Treatments are cause-specific. Ringworm, for example, is contagious and needs a different approach from flea allergy. If signs persist more than a few days, or you see widespread hair loss, book a vet visit rather than cycling through shampoos and home remedies.

Gastrointestinal problems (vomiting, diarrhoea, constipation, hairballs)

What is normal, and what is not

Many cats vomit occasionally, including the odd hairball, especially during heavy shedding. Repeated vomiting, diarrhoea, constipation, or weight loss is a different matter and should not be normalised. It can reflect diet intolerance, parasites, inflammatory bowel disease, or an obstruction.

Home clues worth writing down

• How often it happens, and whether it is linked to meals
• Whether your cat is truly vomiting rather than coughing or regurgitating
• Changes in thirst, appetite, weight, or stool

When to see the vet

If vomiting or diarrhoea persists beyond a day, if there is blood, if your cat is lethargic, or if they cannot keep water down, arrange veterinary care. Dehydration can develop quickly in cats.

Chronic kidney disease (CKD)

How common is it

CKD becomes more likely with age and is most often diagnosed in older cats. Because early CKD can be quiet, it is commonly picked up through routine blood and urine testing rather than obvious symptoms at home.^{7, 8}

Signs owners often notice

• Drinking more and urinating more
• Weight loss and reduced appetite
• Vomiting and low energy

Management

CKD usually cannot be reversed, but it can often be managed for a long time. Diet plays a central role, and your vet may recommend fluids, blood pressure control, and treatments for nausea or poor appetite depending on the stage and symptoms. Staging systems such as those from the International Renal Interest Society (IRIS) help guide care and monitoring over time.⁸

The bottom line

Cat health is a landscape of small signals: a quieter purr, a skipped meal, a long sit in the litter tray. Not every change is an emergency, but patterns matter, and early checks are usually cheaper, gentler, and more effective than late ones. If you are unsure, take a short video of what you are seeing and call your veterinary clinic for advice. Clear observations at home give your vet a much better starting point than guesswork.

References

1. Cornell University College of Veterinary Medicine, Feline Lower Urinary Tract Disease (includes urethral obstruction as an emergency)
2. WSAVA Vaccination Guidelines, Feline vaccination guidelines (core vaccines including FHV-1 and FCV; limitations of protection)
3. RSPCA Australia Knowledgebase, Health risks associated with obesity in cats
4. RSPCA Pet Insurance, Guide to cat dental care (signs of dental disease; brushing)
5. RSPCA Australia Knowledgebase, Fleas and flea control (prevention and safe control)
6. VCA Animal Hospitals, Cystitis and lower urinary tract disease in cats (common signs; obstruction risk)
7. RSPCA (UK), Kidney disease in cats (signs and general management overview)
8. International Renal Interest Society (IRIS), CKD risk factors in cats
9. Peer-reviewed study (PMC), Epidemiology of chronic kidney disease in cats (age distribution; common clinical signs)