Common reasons why cats urinate inappropriately in the house:
1. Cats are clean animals. If they think the litter box is too dirty, not secluded enough, or has a strange smell, they will not urinate in it, resulting in indiscriminate urination everywhere.
2. When a cat is in heat, it will also urinate everywhere in the house. It hopes to attract other cats by leaving more scent through urination, and the cat will roll around on the ground and twist its body, and may also let out low howls.
3. When a new cat or other animal that frightens the cat comes to the house, the cat may urinate everywhere due to excessive stress. 
Solutions for cats urinating indiscriminately at home:
1. If the problem is caused by a dirty litter box, it is recommended that the owner clean the litter box and change the litter in a timely manner, and place the litter box in a quiet corner.
2. If it is caused by heat, it is recommended that the owner have the cat spayed/neutered or allow the cat to mate and reproduce.
3. If the new cat is causing the behavior, it is recommended that the owner comfort the cat and isolate the new cat separately so that they can gradually get to know each other.
