Cats can't tell you they're sick. In fact, they instinctively hide discomfort — a survival trait inherited from their wild ancestors. By the time symptoms become obvious to you, the problem has often been brewing for days or even weeks.
This article will help you spot 10 important signs you shouldn't ignore. For each one, we've flagged the urgency: emergency (see a vet within hours), urgent (within 24 hours), or non-urgent (can be scheduled in a few days, but still needs to be checked). Disclaimer: this article is a general guide, not a substitute for a direct consultation with your vet.
1. Not eating for more than 24 hours
An adult cat skipping a single meal is usually fine — could be boredom, mild stress, or hot weather. But going more than 24 hours without eating at all is not something to brush off.
Cats have a unique metabolism. When fasting for more than 24–48 hours, body fat mobilizes quickly to the liver and can trigger a serious condition called hepatic lipidosis (fatty liver disease). It can be fatal if untreated.
Urgency: Urgent — see a vet within 24 hours, especially for overweight adult cats. For a kitten fasting even 12 hours, treat it as an emergency.
2. Repeated vomiting in one day
One-off vomiting from a hairball or eating too fast is normal. But vomiting more than 2–3 times in a day, or vomit containing blood, thick yellow fluid, or foreign material — that's a serious signal.
Causes can vary: poisoning, intestinal obstruction (string, plastic, bone), pancreatitis, kidney issues, or viral infection. Without an exam, it's hard to pin down.
Urgency: Emergency if vomiting >5 times or there's blood; urgent if 2–3 times and the cat stays lethargic.
3. Diarrhea for more than 24 hours or with blood
Mild diarrhea sometimes pops up from a diet change or mild stress. But if it lasts more than 24 hours, your cat loses fluids and electrolytes fast. If diarrhea contains fresh blood or mucus, that points to serious intestinal inflammation.
Urgency: Urgent within 24 hours; emergency if there's blood or the cat is lethargic and dehydrated.
4. Unusual lethargy and excessive sleeping
Cats sleep a lot — around 12–16 hours a day. But lethargy here means something different: the cat doesn't get up when called, won't play, won't go to the food bowl, or hides in strange spots. The body often curls up with the head pressed to the floor (head pressing) or lies in cold places.
Urgency: Urgent. Lethargy is usually a symptom of an underlying issue.
5. Pale, blue, or yellow gums
Check your cat's gum color by gently lifting the lip. Healthy gums are salmon pink. Watch for:
- Pale / white — possible anemia or shock
- Blue / purple — oxygen deficiency, very urgent
- Yellow — liver problem (jaundice)
Urgency: Emergency for any abnormal color. Don't wait until morning.
6. Labored breathing or open-mouth breathing
Healthy cats breathe 20–30 times per minute at rest, and never breathe with an open mouth except briefly after running or extreme panic. If you see your cat sitting with elbows held away from the body, neck stretched forward, and breathing that looks strained — that's respiratory distress.
Causes can include pleural effusion (fluid in the chest cavity), heart failure, severe asthma, or upper airway obstruction.
Urgency: Absolute emergency. A cat in respiratory distress cannot wait.
7. Can't pee or straining in the litter box
Especially in male cats, this is the most commonly underestimated yet life-threatening sign. A cat repeatedly visiting the litter box, straining, crying out, or only producing drops of urine — could be experiencing urinary blockage.
Without intervention within 24–48 hours, toxins build up in the blood and the cat can die of acute kidney failure.
Urgency: Emergency. Don't delay even on suspicion.
8. Sudden, drastic weight loss
If a cat with normally stable weight suddenly looks thinner over a few weeks (spine and ribs more prominent to the touch), this isn't a "natural diet." Unexplained weight loss in adult cats often links to chronic kidney disease, hyperthyroidism, diabetes, or other serious conditions.
Urgency: Non-urgent but not to be ignored. Schedule a check within 1–2 weeks.
9. Sudden behavior change
A normally friendly cat suddenly turning aggressive, or a normally active cat hiding under furniture for days, often masks pain that isn't visible physically. Same goes for obsessive licking at a specific body area — could be localized pain.
Urgency: Urgent if it lasts >48 hours or comes with other symptoms.
10. Watery eyes, constant sneezing, or severe congestion
Flu-like symptoms in cats are usually caused by upper respiratory viruses (FHV, Calici). Mild cases often recover with rest and nutritional support. But if sneezing comes with thick colored discharge, swollen eyes that won't open, or the cat can't smell its food and stops eating — that needs intervention.
Urgency: Urgent if the cat isn't eating; non-urgent if mild and the cat is still eating normally.
When to pick a house call, when to go to a clinic
For true emergencies — respiratory distress, can't pee, blue gums — head to the nearest 24-hour clinic with inpatient facilities and oxygen. A house call service isn't always the right fit for conditions that need complex equipment.
For urgent or non-urgent symptoms (decreased appetite, mild lethargy, post-vaccine observation, chronic disease follow-up), a house call is much better. The cat isn't stressed by a carrier, isn't exposed to other patients in the waiting room, and the vet has more time to observe behavior in the cat's natural environment.
FAQ
My cat vomits a hairball once a week — is that normal?
A weekly hairball in a long-haired cat is still within normal range, especially during shedding season. But if the frequency rises (several times a week), the vomit contains blood, or your cat seems uncomfortable afterward, it's worth checking. Often simple fixes like regular grooming and anti-hairball supplements help, but a check confirms nothing else is going on.
What's a normal cat body temperature? When is it a fever?
A healthy cat's rectal temperature ranges 38.1–39.2°C (100.5–102.5°F). Above 39.5°C (103.1°F) is considered a fever, and above 40°C (104°F) is urgent. But taking a cat's temperature at home is tricky and stressful for both of you. If you're not used to it, just observe other symptoms: lethargy, not eating, hiding — that's enough reason to consult without confirming the temperature first.
What should I do before the vet arrives at home?
Note the simple things: when your cat last ate and drank, frequency of vomiting/diarrhea today, behavior changes, last vaccine and deworming dates. Don't give human medication (paracetamol is highly toxic to cats). Separate the sick cat from other cats in the house, and prepare a quiet space for the exam.
Wrap-up
Your instinct as a cat owner is usually right. If something feels "off," it's better to consult early than regret being too late. Many feline health issues are very manageable when caught early — they get hard when owners wait until things deteriorate drastically.
Need a consultation or want to book a house call? Message us on WhatsApp — describe the symptoms you're seeing, your area, and your cat's condition. Our team will help assess urgency and schedule the nearest partner vet.
