My kitten has a runny nose — what does it mean?
A kitten with a runny nose and watery eyes most commonly has a mild upper respiratory infection — often referred to as cat flu — which is common in young kittens, especially those from a busy litter, shelter or rescue background. Most cases settle with rest and time, but kittens can go downhill faster than adult cats, so keep a closer eye than you might for a grown-up cat with the same signs.
Usually not urgent
This is common and often manageable at home — but see a vet if it persists, gets worse, or comes with other changes.
What commonly causes it
Feline herpesvirus and calicivirus are the two most frequently seen causes of cat flu, and they spread easily between kittens who have had close contact with other cats, particularly in a shelter or breeding environment. Once a kitten has been exposed, it is common for signs to develop within a few days.
Less often, a runny nose in a kitten comes from a minor irritation rather than an infection — dust, a change in bedding, or a draughty spot — though this is far less common than an infectious cause in a young kitten with any other signs alongside it.
What to watch for
A mild case usually still leaves a kitten bright, playful and interested in food between bouts of sneezing, with clear or slightly cloudy discharge from the nose and eyes. That combination is the less worrying pattern, though it is still worth mentioning to your vet at a routine check.
Take it more seriously if your kitten stops eating, becomes quiet or withdrawn, struggles to breathe, or the discharge becomes thick and coloured. Because kittens are small and eating is closely tied to how well they cope with any illness, a kitten who goes off their food for more than a day needs prompt attention rather than a wait-and-see approach.
Why kittens need closer watching than adult cats
A kitten's immune system and energy reserves are smaller than an adult cat's, so an infection that an adult would shrug off can knock a kitten's appetite and hydration much harder in a shorter space of time. This is not about diagnosing what your kitten has — only a vet examining them can do that — it is about knowing that the same signs carry more urgency in a very young cat.
A blocked nose can also stop a kitten smelling their food properly, which sometimes puts them off eating even when they are not otherwise seriously unwell. Gently wiping the nose clean before mealtimes can help, but a kitten who still will not eat needs to be seen.
What helps while you keep an eye on things
Keep your kitten warm, comfortable and away from other cats while there is any discharge, since the usual causes are contagious. A cosy, draught-free spot to rest in makes a real difference to how a poorly kitten copes.
Warming wet food slightly can make it smell more appealing to a kitten whose sense of smell is blocked, and gently cleaning discharge from the nose and eyes with a soft, damp cloth keeps them more comfortable and helps prevent crusting.
A kitten who is sneezing a lot may also benefit from time in a slightly more humid room, such as sitting nearby while you run a warm shower, which some owners find helps loosen congestion a little. It is a comfort measure rather than a treatment, so it does not replace a vet visit if your kitten needs one.
What your vet will likely check
A vet examining a kitten with a runny nose will typically check their temperature, look at the eyes and mouth for ulcers or other signs sometimes associated with cat flu, listen to their chest, and ask about vaccination history and where the kitten came from.
If your kitten was recently adopted from a rescue or shelter, mention that clearly, since it is relevant context for how likely an infectious cause is and how your vet might want to manage things, including keeping your kitten away from any other cats in the household for a period.
What can help
Things we stock that owners commonly use alongside a vet’s advice — not a substitute for it.
Leucillin Antiseptic Skincare Spray for Cats & Dogs
A versatile, alcohol-free antiseptic spray that cleans, soothes, and helps protect your pet's skin from bacteria, viruses, and fungi.
From£16.49
Window-Mounted Sisal Cat Scratching Post
A suction-mounted pair of sisal columns that gives a cat a proper vertical scratch and stretch on a window or smooth wall, with no drilling and no floor space used.
From£52.99
Absorbent Cotton Gauze Swabs for Pets – Pack of 100
Highly absorbent, low-lint cotton gauze swabs produced in clean conditions — a practical first-aid essential available in three size and ply combinations.
From£4.49
MPS Medical PetS Boot – Waterproof Paw Protector
A vet-recommended waterproof boot that keeps bandages, dressings, and casts dry during walks and wet weather.
£30.49
Common questions
- Is a runny nose in a kitten always cat flu?
- Not always, but it is the most common cause in a young kitten, particularly one from a shelter or busy litter. Other causes are possible, which is exactly why a vet examination rather than a guess from symptoms alone is the way to find out.
- How long does cat flu last in kittens?
- Mild cases often improve within one to two weeks, though some kittens carry the virus and have occasional flare-ups later in life. If symptoms persist beyond two weeks or worsen at any point, contact your vet rather than continuing to wait.
- Should I keep a kitten with a runny nose away from other cats?
- Yes, this is sensible while there is any discharge, since the common causes are contagious to other cats. Keep them separated from other pets in the household until your vet has confirmed it is safe to mix again.
- My kitten has stopped eating as well as having a runny nose — is this serious?
- Yes, treat this as more urgent. A blocked nose can put a kitten off their food, but kittens who do not eat can decline quickly, so contact your vet the same day rather than waiting to see if it improves on its own.
- Can I give my kitten anything at home to help?
- You can keep them warm, clean their nose and eyes gently with a damp cloth, and warm their food slightly to make it smell more appealing. There is no safe home remedy that treats the underlying cause, so anything beyond comfort measures needs a vet's input.
Related
Sources
Written against guidance published by UK veterinary and welfare organisations. Always confirm specifics with your own vet.
Written by Matt Garnett, who runs Giddy Pets and is a lifelong pet owner — not a vet. This is general information, not veterinary advice, and it cannot replace an examination by the vet who knows your animal. How we write these guides.