paranoia

This word is not just about being careful. It describes a strong, often unreasonable feeling that other people want to harm you, trick you, or work against you, even when there is little or no proof. A person might think neighbors are watching them or believe coworkers are trying to ruin their work.

It can describe anything from suspicious thinking to a serious mental health symptom. Most people have brief moments of doubt or mistrust, but this becomes a problem when the fear grows strong, stays for a long time, and starts to affect daily life.

Paranoia is a lasting and often unreasonable distrust of other people. It usually involves the belief that others are trying to harm you, deceive you, watch you, or turn against you, even when the facts do not support that belief. This is more than ordinary anxiety or caution. The fear feels personal, serious, and hard to shake.

It can appear in different ways. Someone might believe that friends are talking about them behind their back, that strangers are following them, or that harmless comments contain hidden threats. What makes it different from everyday worry is that the suspicion can become fixed and hard to question, even when there is no clear evidence.

People also use the word in a broader, everyday way to describe an atmosphere of fear and mistrust, such as in politics, at work, or in a tense social situation. In mental health contexts, though, it usually refers to persistent false or unsupported beliefs about being targeted, controlled, or harmed. In both cases, the idea centers on deep suspicion and the sense that danger is coming from other people.