It is unusual for a cat to be truly missing for weeks. Cats are territorial and generally stay near familiar ground. If your cat has been gone for a long time, possible explanations include injury or entrapment, being taken in by someone who thought it was a stray, finding a new home, or becoming lost.
If your cat is missing, check your immediate surroundings, contact local shelters and rescues, post flyers, and share the news on social media and community groups. Many cats do return on their own, but it is important to stay persistent and proactive.
If you are worried about your cat's welfare, a veterinarian or animal behaviorist can offer guidance.