Psychosis

An idée fixe is a preoccupation of mind believed to be firmly resistant to any attempt to modify it, a fixation.

A paracusia, or auditory hallucination, is a form of hallucination that involves perceiving sounds without auditory stimulus.

Running amok, sometimes referred to as simply amok or gone amok, also spelled amuk, from the Malay language, is "an episode of sudden mass assault against people or objects usually by a single individual following a period of brooding that has traditionally been regarded as occurring especially in Malay culture but is now increasingly viewed as psychopathological behavior occurring worldwide in numerous countries and cultures".

Idiopathic basal ganglia calcification, also known as Fahr disease, is a rare, genetically dominant, inherited neurological disorder characterized by abnormal deposits of calcium in areas of the brain that control movement.

Postpartum psychosis (or puerperal psychosis) is a term that covers a group of mental illnesses with the sudden onset of psychotic symptoms following childbirth.

A delusion is a belief that is held with strong conviction despite superior evidence to the contrary.

Substance-induced psychosis (commonly known as toxic psychosis) is a form of substance use disorder where psychosis can be attributed to substance use.

Stimulant psychosis is a psychosis symptom which typically occurs following an overdose on psychostimulants, but it also occurs in approximately 0.

Anorexia nervosa, often referred to simply as anorexia, is an eating disorder characterized by a low weight, fear of gaining weight, a strong desire to be thin, and food restriction.

Clinical lycanthropy is defined as a rare psychiatric syndrome that involves a delusion that the affected person can transform into, has transformed into, or is a non-human animal.

Paranoia is a thought process believed to be heavily influenced by anxiety or fear, often to the point of delusion and irrationality.

Psychosis refers to an abnormal condition of the mind described as involving a "loss of contact with reality".

Macropsia (also known as megalopia) is a neurological condition affecting human visual perception, in which objects within an affected section of the visual field appear larger than normal, causing the person to feel smaller than they actually are.

Capgras delusion is a disorder in which a person holds a delusion that a friend, spouse, parent, or other close family member (or pet) has been replaced by an identical-looking impostor.

Cotard delusion is a rare mental illness in which the affected person holds the delusional belief that he or she is already dead, does not exist, is putrefying, or has lost his or her blood or internal organs.

Delusional parasitosis, also known as delusional infestation or Ekbom's syndrome, is a delusional disorder in which individuals incorrectly believe they are infested with parasites, insects, or bugs, whereas in reality no such infestation is present.

In psychology, a family nexus is a common viewpoint held and reinforced by the majority of family members regarding events in the family and relationships with the world.

In medicine, a prodrome is an early symptom (or set of symptoms) that might indicate the start of a disease before specific symptoms occur.

Paraphrenia is a mental disorder characterized by an organized system of paranoid delusions with or without hallucinations (the positive symptoms of schizophrenia) without deterioration of intellect or personality (its negative symptom).

Folie à deux (/fɒˈli ə ˈduː/; French pronunciation: ​[fɔli a dø]; French for "madness of two"), or shared psychosis, is a psychiatric syndrome in which symptoms of a delusional belief and hallucinations are transmitted from one individual to another.

Intermetamorphosis is a delusional misidentification syndrome, related to agnosia.

Chronic hallucinatory psychosis is a psychosis subtype, classified under "Other nonorganic psychosis" by the ICD-10 Chapter V: Mental and behavioural disorders.

Brief reactive psychosis, referred to in the DSM IV-TR as "brief psychotic disorder with marked stressor(s)", is the psychiatric term for psychosis which can be triggered by an extremely stressful event in the life of an individual.