Medical issues: Urinary tract infections, kidney disease, and other medical conditions can cause cats to lose control of their bladder and urinate in inappropriate places. If you notice your cat suddenly starting to urinate outside of the litter box, it's important to take them to the vet to rule out any underlying medical problems.
Stress: Stress can also lead to inappropriate urination in cats. Stress can be caused by a variety of factors, such as moving to a new home, changes in routine, or the introduction of a new pet or person into the household. If you think your cat may be stressed, try to identify the source of the stress and take steps to reduce it.
Litter box problems: The litter box itself can also be a source of problems. Cats may avoid using the litter box if it's too dirty, in a noisy or inconvenient location, or if they don't like the type of litter that's being used. Make sure to keep the litter box clean and in a quiet, secluded spot. You may also want to try different types of litter until you find one that your cat prefers.
Territorial marking: Male cats are more likely to urinate outside of the litter box in order to mark their territory. This is especially common in unneutered males. Neutering your cat can help to reduce territorial marking behavior.
Behavioral problems: In some cases, inappropriate urination can be a sign of a behavioral problem. If your cat is urinating on personal positions or other inappropriate places, it's important to consult with a veterinarian or animal behaviorist to rule out any underlying medical or behavioral problems.