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Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Most cat behavior problems have one of three starting points: a medical issue, a stressor in the home, or a cat whose environment does not meet its needs. Many owners assume a cat is being spiteful, but that explanation is rarely the right one. For any behavior that is new, sudden, or persistent, the first step is a veterinary check to rule out illness or pain. Training and environmental changes come after that.
This guide groups ten common problems that overlap in practice. The count is an editorial choice made to organize the topic. It is not a ranked list or a universal top ten endorsed by veterinary authorities. Each section separates behavior that is normal for cats from behavior that is harmful, persistent, or newly changed.
Start with the medical question
A behavior change can be the first visible sign of a health problem. Cornell University College of Veterinary Medicine and the American Veterinary Medical Association (AVMA) both recommend professional assessment when a cat shows urinary signs. Contact a veterinarian promptly if you notice any of the following:
- Repeated straining in the litter box, or frequent trips with little or no urine produced
- Blood in the urine, or crying while urinating
- Licking at the genital area more than usual
- Hair loss, skin lesions, or bald patches from grooming
- Sudden aggression, withdrawal, or a new reluctance to be handled
Suspected urinary obstruction is an emergency. Cornell advises immediate veterinary attention, and the condition should never be left to wait until the next day. Do not treat it at home, and do not give any medication without veterinary direction.
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Ask four questions before you change anything
Once a veterinarian has ruled out medical causes, these questions help you describe the problem and choose a sensible response. They also give your vet a clearer picture if the behavior continues.
- Is the change sudden or longstanding? A new behavior that started recently deserves a closer medical look than something the cat has always done.
- What triggers it? Note the location, time of day, other animals or people nearby, and what happened just before.
- What does the cat prefer? Pay attention to the surface, texture, position, and location the cat chooses, since these often guide practical fixes.
- Is the home meeting the cat’s needs? Consider whether there are multiple cats and enough separate resources (litter boxes, food, water, resting places), and whether the problem improves after environmental changes.
Litter box problems
1. House soiling and litter-box avoidance
House soiling, meaning urinating or defecating outside the litter box, is the most common behavior problem cat owners report, according to Cornell’s house-soiling guidance (last updated January 2015). It can come from a medical problem, from an aversion to the box, its litter, or its location, or from a preference for another surface or place.
Begin by ruling out illness, then examine the setup. Common issues include a dirty box, a covered box the cat dislikes, a box placed near a noisy appliance or a food bowl, and litter that the cat finds unpleasant. Cats rarely soil out of spite, so punishing a cat for an accident usually makes the problem worse by teaching it to fear the owner or to hide its elimination.
2. Urine spraying
Spraying is a marking behavior, not ordinary urination. A cat typically stands with its tail held upright, often quivering, and backs up to a vertical surface such as a wall, a door, or furniture, depositing a small amount of urine. Spraying is linked to territory and to circumstances in the home, such as the presence of another cat outside a window or a change in household composition.
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Distinguishing spraying from house soiling matters because the fixes differ. Note the posture and where the urine lands. Describing this accurately helps a veterinarian interpret the problem and decide whether medical evaluation is needed.
Scratching, chewing, and plant nibbling
3. Scratching furniture or carpets
Scratching is normal. It serves to maintain claws and to mark territory with scent from the paw pads. The problem arises when the cat chooses furniture or carpet instead of an appropriate scratcher.
Cornell recommends observing which way the cat scratches and what material it chooses. Some cats prefer vertical posts, others prefer horizontal surfaces, and many have a favorite fabric or texture. Select a scratcher that matches the surface and orientation the cat already uses, place it next to the existing scratch spot, and reward the cat when it uses it. A scratcher is a redirect, not a guaranteed fix, and some cats will still scratch the furniture if the new option does not match their preference. Cornell also warns that punishment can cause fear and may worsen the behavior.
4. Destructive chewing
Cats may chew fabric to explore, to play, or for comfort. Chewing is only a concern when it is persistent or dangerous. Swallowed fabric, string, or ribbon can cause a life-threatening intestinal obstruction. Cornell’s guidance on destructive behavior (last updated March 2018) advises blocking access to dangerous objects and offering appropriate alternatives such as chew-safe toys.
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If you find a cat swallowing or chewing items it should not, or if it vomits, stops eating, or seems unwell after chewing, see a veterinarian promptly.
5. Plant chewing
Many cats nibble plants out of curiosity or as a form of play. Some common houseplants and garden plants are toxic to cats, so there is no safe default assumption. Do not rely on a short list of safe plants. If you are concerned about a specific plant, contact your veterinarian or a poison-control service with the plant’s name, the amount eaten, and the cat’s symptoms.
Aggression and rough play
6. Aggression toward people or other animals
Cornell describes several distinct forms of feline aggression: play, fear, petting-induced, redirected, pain-induced, and territorial. Each has different triggers and calls for different management, so identifying the pattern comes first.
- Fear-based aggression often shows as flattened ears, a crouched posture, or a tucked tail, with the cat trying to escape before it lashes out.
- Petting-induced aggression can occur when a cat tolerates handling for a while and then bites or swats, often with the tail twitching or skin rippling beforehand.
- Redirected aggression happens when a cat is aroused by something it cannot reach, such as a neighborhood cat outside, and directs its reaction at a nearby person or pet.
- Pain-induced aggression may appear suddenly in a cat that was previously calm, which is why a medical check matters.
- Territorial aggression is directed at other cats or animals that enter a space the cat considers its own.
Physical punishment does not resolve aggression and tends to increase fear. Cornell advises consulting a veterinarian to rule out medical causes before treating the behavior as a training issue. For persistent aggression, a veterinary behaviorist can help design a plan.
7. Rough play, chasing, and biting
Play aggression is common, particularly in young cats and in cats that have had limited chances to practice appropriate play. The cat may stalk and pounce on ankles or hands, especially in predictable contexts such as early morning or late evening. Cornell’s guidance is to identify these times and redirect the play to a toy rather than a hand. Keep hands away from toys used for redirection, because a cat that learns to bite a moving hand may continue doing so.
Short, structured play sessions with wand toys or a toy on a string, offered before the cat’s predictable energy spikes, often reduce biting. Regular play helps most when it is consistent and when the cat is allowed to finish the “hunt” with a small meal or treat.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Grooming and stress
8. Overgrooming
Grooming is a normal part of feline life. Cats typically spend between 30 and 50 percent of their day grooming themselves, according to Cornell University College of Veterinary Medicine (the consulted page does not state a publication year). Overgrooming is different: the cat grooms so much that it develops bald patches, scabs, or skin irritation.
Cornell veterinary behavior resident Pamela Perry, D.V.M., explains: “If all medical problems have been ruled out, then we normally treat over grooming as the result of some form of stress in a cat’s life.” This means that medical causes, including skin problems, pain, and parasites, should be investigated before stress is assumed. Hair loss or skin lesions are reasons to take the issue seriously rather than wait.
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9. Stress-related behavior and household conflict
Changes in routine, a new person or pet, a move, or conflict between cats can be stressful. Stress may contribute to overgrooming and to feline idiopathic cystitis, a bladder condition that a veterinarian must diagnose.
Cornell and the AVMA’s 2024 brochure both describe practical environmental measures that help:
- Introduce changes gradually, and keep familiar bedding and toys available.
- Provide vertical space such as shelves, cat trees, or window perches so the cat can retreat above the household.
- Offer regular play and predictable feeding times.
- In multi-cat homes, provide separate resources, including litter boxes, food and water bowls, and resting spots, so cats do not need to share or compete for them.
Stress-related signs often improve gradually after these changes, so give the adjustments time and track the behavior rather than expecting an immediate result.
Vocalizing and changes in older cats
10. Excessive or nighttime vocalizing
Cats vocalize for many reasons, including hunger, attention, and boredom. Loud or frequent vocalizing, especially at night, is one of the signs Cornell lists for possible cognitive dysfunction in older cats. Nighttime vocalizing can also be associated with health problems such as hyperthyroidism or hypertension. The behavior is therefore a reason to schedule a veterinary assessment, not proof that the cat is experiencing cognitive decline.
If your older cat becomes newly restless at night, withdraws, shows confusion, or changes its sleep-wake pattern, record when the behavior happens and bring those notes to your veterinarian. Good records make it easier to tell medical, cognitive, and environmental causes apart.
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