Delusions are fixed, false beliefs that are held with strong conviction despite clear evidence to the contrary and are not consistent with the person's cultural or religious background. They are one of the hallmark symptoms of psychotic disorders, especially schizophrenia, but may also occur in mood disorders with psychotic features, delusional disorder, dementia, substance-induced psychosis, and certain neurological conditions. Delusions vary in content, complexity, and impact on an individual's thoughts, emotions, and behavior. Persecutory delusions are the most common type. Individuals believe that they are being harmed, followed, spied on, poisoned, cheated, or conspired against by others. They may suspect family members, neighbors, government agencies, or strangers without any objective evidence. Such beliefs often lead to fear, mistrust, social withdrawal, and defensive behavior. Delusions of grandeur, also known as grandiose delusions, involve exaggerated beliefs about one's importance, power, wealth, knowledge, or identity. A person may believe that they possess extraordinary talents, have a special mission, or are a famous historical or religious figure. These beliefs are maintained despite contradictory evidence and may interfere with daily functioning. Delusions of reference occur when individuals believe that ordinary events, comments, television programs, newspaper articles, songs, or gestures have a special and personal meaning directed specifically at them. Neutral events are misinterpreted as containing hidden messages or signals intended for the individual. Somatic delusions involve false beliefs concerning the body or physical health. A person may believe that internal organs are rotting, insects are crawling under the skin, or