Male cats may spray indoors for several reasons:
1. Marking territory
2. Sexual maturity (usually around 6–8 months)
3. Stress or anxiety
4. Medical issues such as urinary tract infections
5. Learned behavior from other cats
Solutions include neutering, providing a safe environment with enough resources, managing stress, cleaning sprayed areas with enzymatic cleaners, and using deterrents. If spraying continues, consult a veterinarian or feline behaviorist.