Paranoia is the feeling that others are against you or are trying to harm you in some way, when that really isn’t the case. We all have conflicts with others every now and then, but most of the time people aren’t actually out to get us. The occasional paranoid thought isn’t unusual, as Paranoid Thoughts noted. However, if such thoughts are more than occasional or if they cause you a lot of distress, then it may be a sign of a mental illness such as schizophrenia or bipolar disorder. These illnesses can be successfully treated with medications and you can learn coping skills to help with paranoid thoughts.