Yes, cats produce several types of discharge from their eyes, nose, ears, and other areas as part of normal body function. A small amount of clear discharge from the eyes or a thin layer of wax in the ears is perfectly healthy. The key question is when discharge shifts from normal to a sign of illness, and the answer usually comes down to color, consistency, amount, and smell.
Eye Discharge: Clear vs. Colored
Healthy cats often have a small amount of clear, watery discharge in the corners of their eyes, especially after sleeping. Some breeds with flat faces, like Persians, produce more of it because their tear ducts don’t drain as efficiently. This is cosmetic, not medical.
The concern starts when that discharge changes. Yellow or green discharge that looks thick or mucus-like typically signals an infection, whether bacterial, viral, or related to an underlying condition like feline herpesvirus. Rusty-brown crusty buildup around the eyes can indicate chronic tearing that oxidizes on the fur, which is common in light-colored cats but worth monitoring. If your cat is also squinting, has swollen eyelids, or one pupil looks different from the other, those are signs the problem could threaten their vision.
To clean discharge safely, dip a cotton ball in plain water and wipe from the inner corner of the eye outward. Use a fresh cotton ball for each eye. Skip over-the-counter eye drops unless a vet has specifically recommended them, as the wrong product can make things worse.
Nasal Discharge and Upper Respiratory Infections
A tiny bit of moisture around a cat’s nostrils is normal. Persistent nasal discharge is not. Upper respiratory infections are extremely common in cats, and the progression of nasal discharge tells a clear story: it starts clear and watery in the early viral stage, then thickens into a yellow or greenish mucus as bacteria take advantage of the weakened tissues. Sneezing, loss of appetite, and lethargy usually accompany it.
Feline herpesvirus and calicivirus are the two most frequent causes. Bacteria often pile on as secondary infections once the virus has done its initial damage. Cats in shelters, multi-cat households, or those with weakened immune systems are especially prone. One-sided nasal discharge (only from one nostril) can sometimes point to a foreign object, dental problem, or nasal polyp rather than a typical cold.
Ear Wax and Ear Mites
Healthy cat ears are pink, clean, and have very little wax. A small amount of light-colored wax is normal, but anything beyond that deserves attention. Dark brown or black, crumbly wax that looks like coffee grounds is the hallmark of ear mites, the most common cause of ear problems in cats. These parasites are too small to see without a microscope, but the debris they leave behind is unmistakable.
Other ear infections can produce cream-colored, orange, or dark brown wax in larger quantities than usual. Watch for head shaking, tilting, pawing at the ears, sensitivity when you touch around the ear area, or a noticeable smell. Cats with ear problems sometimes lose their balance because the inner ear plays a role in spatial orientation.
Vaginal Discharge
Unlike dogs, cats rarely show visible vaginal bleeding or discharge during their heat cycle. Proestrus in cats is notoriously hard to detect visually. Occasionally a cat in heat will have a very slight mucoid discharge from the vulva, but most owners never notice it. Behavioral changes (yowling, restlessness, assuming a mating posture) are far more reliable signs of heat than any physical discharge.
Visible vaginal discharge in a cat, especially one that hasn’t been spayed, is a red flag for pyometra, a serious uterine infection. In an “open” pyometra, the cervix allows pus to drain, producing a creamy, foul-smelling vaginal discharge. The cat’s belly may look distended from the swollen uterus. The tricky part is that cats with open pyometra often keep eating and grooming normally, so they don’t seem as sick as they actually are. Fastidious cats may clean the discharge away entirely, leading owners to assume the cat is simply pregnant. Pyometra can be life-threatening and typically requires surgery.
Anal Gland Secretions
Cats have two small sacs on either side of their anus that produce a strong-smelling fluid used for scent marking. You’ll rarely notice this secretion under normal circumstances because it gets expressed naturally during bowel movements.
Problems arise when the ducts become swollen or blocked. Impacted anal glands produce fluid that grows thicker and darker than normal. Left untreated, the fluid becomes bloody and eventually turns into pus, forming an abscess. If the abscess ruptures, you’ll see greenish-yellow or bloody, sticky discharge draining from a spot near the anus. Scooting across the floor, excessive licking of the rear end, and visible discomfort while sitting are the behavioral clues.
Urinary Changes That Look Like Discharge
Cats don’t typically produce urethral discharge the way some animals do, but urinary tract issues can create confusing signs. Feline lower urinary tract disease causes bloody urine, straining in the litter box, urinating in unusual places, and frequent small attempts to urinate. Owners sometimes mistake bloody urine spots on bedding or fur for genital discharge. A male cat straining to urinate and producing nothing is a medical emergency, as a urethral blockage can become fatal within 24 to 48 hours.
When Discharge Signals Trouble
A small amount of clear eye moisture, minimal ear wax, and invisible anal gland secretions are all part of a healthy cat’s biology. The patterns that should prompt a vet visit are consistent across body areas: any shift from clear to colored (yellow, green, white), any increase in volume, any new or foul smell, and any discharge accompanied by behavioral changes like lethargy, appetite loss, or pain. Cats are skilled at hiding illness, so by the time discharge becomes obvious, the underlying problem may have been developing for a while.