Discharge leaking from a cat can come from several different places: the eyes, nose, rear end, a wound, or a surgical site. The cause ranges from a minor infection to a life-threatening uterine condition, so identifying where the fluid is coming from and what it looks like is the first step in figuring out what’s going on.
Figuring Out Where the Discharge Is Coming From
Before anything else, take a close look at your cat. Part the fur and check the area where you’re seeing wetness or staining. Discharge from the vulva or penis typically shows up on your cat’s bedding or on the fur around the hind legs. Discharge from a wound or abscess may be hidden under matted fur, and you might smell it before you see it. Eye and nasal discharge are usually easier to spot.
The color, smell, and consistency all matter. Clear fluid is less alarming than yellow, green, or bloody discharge. A foul smell almost always signals infection. If your cat is also lethargic, not eating, running a fever, or straining to urinate, something more serious is likely happening.
Vaginal Discharge in Female Cats
Pyometra: Infected Uterus
If your unspayed female cat is leaking cream-colored or bloody fluid from her vulva, pyometra is one of the most dangerous possibilities. Pyometra is a bacterial infection of the uterus that typically develops a few weeks after a heat cycle, when hormonal changes make the uterine lining vulnerable to bacteria. When the cervix stays open, the infection drains outward as visible discharge. When the cervix is closed, the pus stays trapped inside, and the cat can become critically ill with no visible leaking at all.
Even with an open cervix and visible drainage, cats with pyometra often show signs of systemic illness: lethargy, loss of appetite, increased thirst, vomiting, or fever. This condition requires emergency veterinary treatment, almost always surgery to remove the infected uterus. Without it, the infection can become fatal.
Pregnancy and Postpartum
If your cat is pregnant, vaginal bleeding is not normal and may indicate she’s losing the litter. After giving birth, though, some discharge is expected. A dark, reddish-black fluid (mostly old blood) can continue draining for up to three weeks postpartum. If the discharge turns pus-like or looks unusually bloody, that suggests a uterine infection or excessive blood loss, and she needs veterinary attention.
Urinary Tract Problems
Cats with lower urinary tract disease sometimes leave small spots of bloody or mucus-tinged fluid on furniture, bedding, or in the litter box. This can look like discharge from the genitals, but it’s actually coming from the urinary tract. You’ll usually notice other signs too: your cat squatting frequently, straining to urinate, crying while urinating, or urinating outside the litter box.
Several conditions cause these symptoms. Feline idiopathic cystitis (a stress-related bladder inflammation) is the most common in younger cats. Bladder stones, urinary infections, and urethral plugs made up of protein, inflammatory cells, and crystals can also be responsible. In male cats especially, a urethral blockage can prevent urination entirely, which becomes a life-threatening emergency within 24 to 48 hours. If your male cat is straining to urinate and producing little or nothing, get him to a vet immediately.
Abscesses From Bite Wounds
Outdoor cats and cats in multi-cat households are prone to bite wound abscesses. When a cat gets bitten, bacteria from the other cat’s mouth get driven deep under the skin. The wound seals over on the surface, trapping infection underneath. Over the next few days, the immune system fights the bacteria, and the damaged tissue liquefies into pus. Eventually, the pocket of pus ruptures through the skin and drains.
The discharge from a ruptured abscess is unmistakable: thick, often greenish or yellowish, and extremely foul-smelling. Sometimes you won’t see the wound at all because it’s buried under fur, but you’ll smell it. The area around the abscess is typically warm, swollen, and painful to touch. Abscesses need veterinary care to be properly flushed and treated with antibiotics, since the deep puncture wounds that cause them don’t heal well on their own.
Eye and Nasal Discharge
Upper respiratory infections are extremely common in cats, particularly kittens and shelter cats. They’re caused by viruses (most often feline herpesvirus and calicivirus) and sometimes secondary bacterial infections. Early on, the discharge from the eyes and nose is clear and watery. As the infection progresses, it thickens and turns yellowish or greenish with a pus-like appearance. You may also see sneezing, coughing, mouth ulcers, swollen membranes around the eyes, and loss of appetite.
A cat with clear, occasional eye tearing and no other symptoms may just have a minor irritant. But colored, thick discharge from both the eyes and nose, especially paired with lethargy and not eating, points to an active respiratory infection that may need treatment.
Anal Gland Problems
Cats have two small scent glands just inside the anus that normally release a small amount of dark, strong-smelling fluid when they defecate. Most cat owners never notice it. Problems arise when the fluid thickens and can’t drain properly, a condition called impaction. If bacteria grow in the impacted glands, the fluid turns into yellow or bloody pus.
Some cats are born with anal openings that don’t close tightly, and these cats constantly leak small drops of anal gland fluid wherever they sit. If you’re finding tiny, extremely pungent spots on furniture or bedding near where your cat rests, this could be the source. Scooting along the floor, licking at the rear end excessively, or visible swelling near the anus are other giveaways. Impacted or infected anal glands need to be expressed and possibly treated by a vet.
Discharge After Surgery
If your cat was recently spayed, neutered, or had another surgical procedure, a small amount of blood seeping from the incision within the first 24 hours is normal, especially if your cat has been moving around. After that initial period, the incision should stay dry.
Signs that something is wrong include continuous dripping or seepage of blood, any blood leakage that continues beyond 24 hours, swelling or excessive redness around the incision, foul smell, or discharge that looks cloudy or pus-like. These suggest the incision may be infected or hasn’t closed properly, and your vet should see it right away.
What the Color and Smell Tell You
- Clear fluid: Often minor. Could be normal tears, mild irritation, or early-stage respiratory infection.
- Yellow or green fluid: Indicates infection, whether from an abscess, respiratory illness, infected anal glands, or uterine infection.
- Cream-colored or white: Suspicious for pyometra in unspayed females.
- Bloody or blood-tinged: Could stem from urinary tract disease, trauma, a ruptured abscess, or reproductive issues.
- Dark, reddish-black: Normal postpartum discharge in a cat that recently gave birth, as long as it doesn’t become pus-like.
- Foul-smelling: Almost always means infection. The worse the smell, the more urgent the situation.
Any discharge paired with lethargy, fever, refusal to eat, vomiting, or straining to urinate warrants urgent veterinary care. Even discharge that seems minor can point to conditions that worsen quickly, particularly pyometra and urinary blockages, both of which can become fatal without treatment.