The core principle of cat symptom self-checking: first look at the four major indicators—demeanour, appetite, breathing, and excretion. If all four are normal and symptoms are mild, you can observe at home for 24 hours; but if there's difficulty breathing, persistent vomiting, food refusal for more than 24 hours, seizures, or heavy bleeding, that's a red line—go to a 24-hour emergency vet immediately.
Why are cat symptoms so hard to spot?
Cats are predators and also prey. This evolutionary background makes cats naturally skilled at hiding pain and discomfort—by the time you clearly see your cat is 'obviously unwell', the illness has often been developing for some time.
In Hong Kong veterinary practice, the phrase cat owners say most often is 'he was fine yesterday'. But the reality is: changes in a cat's food intake, water intake, and urination frequency usually appear days to weeks before 'looking lethargic'. So the key to self-checking isn't waiting for obvious symptoms—it's establishing a baseline: record daily how much your cat eats, how much it drinks, how many times it uses the litter box, and what the poop looks like. With a baseline, you'll notice any deviation immediately.
This guide has three parts: 12 common symptom quick-reference cards (each symptom links to an in-depth article), the 🟢🟡🔴 red-line triage table (decide within minutes whether to see a vet), and real Hong Kong vet fees (so you have a budget before you go).
12 common symptom quick-reference cards
Listed below in order of 'most searched and most common among Hong Kong cat owners'. Each symptom has its own in-depth article covering causes, home management, when to see a vet, and treatment directions.
- 1. Cat ringworm (circular hair loss, dandruff, crusts) — A fungal infection that can spread to humans. Circular hair loss with scaly edges is typical; kittens, senior cats and immunocompromised cats are most susceptible. Zoonotic—take extra care if you have children at home.
- 2. Cat vomiting (triage by vomit colour) — Colour and contents reveal severity: white foam/yellow fluid usually means an empty stomach or stomach acid; coffee-coloured/red requires immediate medical attention.
- 3. Cat sneezing, runny nose, eye discharge (upper respiratory infection) — Particularly common in Hong Kong's humid season. Mild cases can be managed at home, but food refusal + nasal congestion is a dangerous combination—a cat that doesn't eat for 24 hours is in trouble.
- 4. Cat ear mites (frantic head shaking, ear scratching, black earwax) — Earwax looks like coffee grounds, ear canal is red. Highly contagious; multi-cat households need to treat all cats together.
- 5. Cat stomatitis (drooling, food refusal, bad breath) — Severe inflammation of the gums and mouth, painful enough that the cat won't eat. A chronic long-term problem; the earlier it's addressed, the better.
- 6. Cat skin diseases (itching, rash, hair loss, crusts) — Many causes: fungus, mites, fleas, allergies, stress. You need to identify the cause to treat correctly; applying ointment blindly can make it worse.
- 7. Cat diarrhoea, soft stool, abnormal poop — Check shape, colour, and presence of blood/mucus. Acute diarrhoea usually improves within 48 hours, but blood, black tarry stool, or accompanying vomiting warrants a vet visit.
- 8. Cat eye discharge, red eyes, squinting — Cat eye diseases can worsen very quickly; corneal ulcers handled incorrectly can affect vision. Don't use human eye drops on your own.
- 9. Cat kidney disease (increased drinking and urination, weight loss, bad breath) — The most common chronic disease in senior cats (7+), with no obvious early symptoms—only blood tests reveal it. Increased drinking and urination isn't 'healthy hydration'—it's a warning sign.
- 10. Cat constipation (long time in litter box, no poop) — Watch if no bowel movement for over 48 hours; over 72 hours, or straining to the point of crying out, or vomiting, is an emergency.
- 11. Cat asthma, coughing, noisy breathing — Feline asthma isn't like human asthma; it often presents as a dry cough/retching cough, frequently mistaken for trying to bring up a hairball.
- 12. Cat dehydration (slow skin recoil, dry gums) — Dehydration is a common consequence of many diseases and one of the fastest fatal risks. Learning to check skin elasticity at home can save a life.
- 13. Cat pancreatitis (poor appetite, abdominal pain, vomiting) — Pancreatitis symptoms in cats are extremely subtle; the common triad is 'decreased appetite + lethargy + intermittent vomiting', and a blood test (fPL) is needed for diagnosis.
🟢🟡🔴 Red-line triage table
How to use: find your cat's symptom and see which level it falls under. If unsure, always treat it as one level higher—having a vet tell you 'it's nothing' at the clinic is better than waiting at home for it to get worse.
| Symptom | 🟢 Observe at home for 24 hours | 🟡 Book a vet within 24 hours | 🔴 Go to 24-hour emergency immediately |
|---|---|---|---|
| Vomiting | Occasional hairball (1–2 times a month), normal demeanour and appetite afterwards | Vomiting 2–3 times a day, bringing up yellow-green bile, still alert afterwards | Blood or coffee-coloured vomit, continuous vomiting that won't stop, accompanied by abdominal pain and crying |
| Diarrhoea | Soft stool but good demeanour, appetite present, no blood or mucus | Diarrhoea more than 3 times a day, lasting over 24 hours | Blood or black tarry stool, accompanied by vomiting or complete food refusal |
| Breathing | Sneezing, small amount of clear nasal discharge, normal demeanour | Nasal congestion affecting eating, yellow-green purulent discharge | Open-mouth breathing, rapid breathing, blue tongue/gums, panting and unwilling to move |
| Appetite | Eating less but still eating, normal demeanour | Refusing one meal, or no food for over 12 hours | Complete food refusal for over 24 hours (cats rapidly develop fatty liver) |
| Demeanour | More tired than usual but still interactive | Hiding, ignoring people, slower responses | Convulsions/seizures, unrousable, limp and weak |
| Excretion | Slightly hard or soft stool, still daily | No bowel movement for 24 hours, or reduced urine output | No bowel movement for over 48 hours, or no urine for over 24 hours |
| Eyes | Small amount of eye discharge, no redness or swelling | Red eyes, squinting, persistent tearing | Obvious eye swelling, cloudy cornea, unable to open eyes at all |
| Ears | Occasional ear scratching | Persistent head shaking, red swollen ear canal, earwax like coffee grounds | Pus from ear canal, severe pain, head tilt, loss of balance |
| Skin | Small amount of dandruff, seasonal shedding | Localised circular hair loss, itching, rash | Large areas of red swollen oozing skin, purulent wounds, accompanied by fever |
| Mouth | Slightly stronger breath | Drooling, crying out in pain when eating, obvious bad breath | Complete refusal to eat, heavy bleeding in mouth, loose teeth |
| Mobility | Brief stiffness, slow to get up | Limping, hesitant to jump up or down | Sudden hind leg paralysis, dragging legs, crying out in severe pain (suspected blood clot) |
| Temperature and drinking | Slightly more drinking in hot weather | Markedly increased drinking and urination, weight loss | Abnormally high/low body temperature, collapse, whole-body trembling |
| Poisoning signs | — | Suspected ingestion but normal demeanour | Seizures, continuous drooling, vomiting blood, unsteady standing (ingestion of lilies, chocolate, rat poison, human medication) |
Real Hong Kong vet fees (published prices on clinic websites)
What many cat owners worry about most isn't the illness—it's 'not knowing how much it will cost'. Below are consultation fees published on the official websites of two Hong Kong vet clinics, 2026 data, to help you budget. Note: consultation fees only cover the consultation and basic examination; blood tests, X-rays, ultrasound, hospitalisation, etc. are quoted separately, and actual charges are confirmed by the clinic based on your pet's condition.
Hong Kong Leo Animal Medical Centre (Yau Ma Tei) official fee schedule:
- Basic consultation: $350
- Night consultation: $600
- Emergency consultation: $600
- Referral consultation: $600
- Cat/dog vaccination: $300
- Microchip implantation: $300 (AVID/ISO)
- Health certificate: $1,000
Creature Comforts (East District Animal Hospital / Tseung Kwan O Veterinary Clinic) official fee reference (consultation only):
- Tseung Kwan O Veterinary Clinic: from $420
- East District Animal Hospital (daytime 8am–9pm): from $370
- East District Animal Hospital (evening 9pm–12am): from $550
- East District Animal Hospital (late-night emergency 12am–8am): from $1,100
- Home vet service: from $1,050
⚠️ Prices are subject to the clinic's latest announcement; this article is for reference only. Don't delay seeing a vet because you're worried about cost—many feline emergencies (urethral obstruction, poisoning, breathing difficulty) are decided by 'a few hours earlier or later'.
7 things to prepare before seeing the vet
Being well prepared helps the vet diagnose faster and reduces repeat tests and costs:
- Symptom timeline: when it started, how many times a day, any changes. Use your phone to record video (vomiting, seizures, breathing)—ten times more accurate than describing it.
- Bowel and bladder record: any bowel movements in the past 48 hours, urine colour and volume, any blood.
- Diet record: which food, any recent food changes, any human food or new treats.
- Vomit/poop sample: take photos with your phone, or bring a sample in a clean bag.
- Medications and medical history: current medications, supplements, past medical history (referral records are even better).
- Vaccination and deworming record: vaccination card, date of last deworming.
- Cat carrier + pee pads: cats must be in a carrier for vet visits—don't carry them in your arms in the car, to avoid them getting frightened and running off.
4 indicators to monitor during home observation
If symptoms are 🟢 level, you can observe at home for 24 hours, but you must record the following four items:
- Food intake: how many grams/cans per day, whether it has dropped by more than half.
- Water intake: measure with a graduated water bowl; a sudden large increase or decrease is a warning sign.
- Urination and defecation frequency: record when cleaning the litter box daily; if you can't find poop, pay attention.
- Demeanour: does your cat come to greet you, is it hiding, how does it respond to toys.
Iron rule of observation: if any one of these clearly worsens within 24 hours, don't wait any longer—book a vet directly.
If symptoms are at red-line level, go to a 24-hour vet immediately; don't wait for the daytime clinic to open.
Frequently asked questions
Q: At what age should cats start regular blood tests? A: Senior cats aged 7 and above should generally have blood tests every 6–12 months, as kidney function, thyroid and blood sugar levels can show abnormalities before symptoms appear. For kittens and young cats with chronic disease risk, your vet may also recommend starting earlier.
Q: How long can a cat go without eating before it must see a vet? A: A cat that completely refuses food for more than 24 hours should see a vet. Cats have a unique liver metabolism, and prolonged fasting causes fat to break down rapidly and accumulate in the liver, triggering fatty liver—a potentially fatal complication. So 'not eating' is itself an emergency-level symptom.
Q: How does Hong Kong's humid weather relate to cat symptoms? A: Hong Kong's high humidity in spring and summer clearly increases fungal infections (ringworm), mould, ear mites and bacterial skin problems. Meanwhile, opened cat food easily absorbs moisture and spoils, causing digestive upset. It's advisable to dehumidify your home, store food in sealed containers, and clean the litter box more thoroughly.
Q: How do I tell the difference between a cat vomiting a hairball and true vomiting? A: Hairball vomiting usually follows a pattern of 'retching → passing a cylindrical hairball → immediately back to normal'. If your cat brings up food, yellow fluid or white foam, and it happens repeatedly with lethargy afterwards, that's true vomiting and should be assessed using the red-line triage table.
Q: Can I buy medication for my cat myself? A: Absolutely not. Many human medications (such as paracetamol/Acetaminophen and ibuprofen) are highly toxic to cats, and even tiny doses can be fatal. Cats metabolise drugs differently from humans, so any medication must be prescribed by a vet.
Q: What's the difference between choosing a daytime or nighttime vet visit? A: Based on published fee schedules, a basic daytime consultation generally starts from $350–$420, while nighttime fees can rise to $600–$1,100, with late-night emergencies costing the most. If symptoms are 🟢🟡 level, a daytime appointment can save you a fair amount; but for 🔴 level, you shouldn't wait until dawn just to save money.
Q: What PetChill products can help with home care? A: 【PetChill HK】offers a range of cat home-care products, including dehumidifying moisture-proof food storage containers, litter box cleaning supplies, hairball gel, pill dispensers and water syringes. Self-pickup is available at our Fo Tan, Yuen Long and Fanling stores to support you during the observation period.
Sources
- Hong Kong Leo Animal Medical Centre (LAMCVET) consultation fee schedule — basic/night/emergency consultation fees and vaccination, microchip charges
- Creature Comforts (East District Animal Hospital / Tseung Kwan O Veterinary Clinic) consultation fees and service description — daytime, evening, late-night emergency and home visit fee reference
Disclaimer
This content is general pet health information and cannot replace veterinary diagnosis or treatment. Every cat's physical condition, medical history and medication contraindications are different; any assessment of symptoms and treatment plan must be decided by a registered veterinarian after an in-person examination. If your cat shows red-line symptoms, please go to a vet clinic or 24-hour emergency animal hospital immediately. Fee information in this article is excerpted from clinic official websites; prices may change at any time and are subject to the clinic's latest announcement.
Key takeaways
- Self-check the four major indicators first: demeanour, appetite, breathing, excretion; if all four are normal, observe for 24 hours
- 🔴 Red lines (go to emergency immediately): open-mouth breathing, seizures, persistent vomiting, food refusal for over 24 hours, no bowel movement for over 48 hours / no urine for 24 hours, heavy bleeding, suspected poisoning
- Published Hong Kong clinic fees: daytime from about $350–$420, nighttime from about $550–$600, late-night emergency from about $1,100 (blood tests and imaging extra)
- Food refusal in cats is an emergency-level symptom—24 hours without eating already carries fatty liver risk
- Human medications can be fatal to cats—never give medication on your own
Feline Natural full guide →