Symptoms or signs involving content of thought

Description

Symptoms and signs involving content of thought include delusions, experiences of influence, passivity, and control, grandiosity, homicidal ideation, identity disturbance, obsessions, overvalued ideas, paranoid ideation, referential thinking, suspiciousness, and suicidal ideation. [1]

Subcategories

• MB26.0 Delusion

  A belief that is demonstrably untrue or not shared by others, usually based on incorrect inference about external reality. The belief is firmly held with conviction and is not, or is only briefly, susceptible to modification by experience or evidence that contradicts it. The belief is not ordinarily accepted by other members or the person's culture or subculture (i.e., it is not an article of religious faith). [1]

• MB26.1 Experiences of influence, passivity, and control

  The experience that one's feelings, impulses, thoughts, bodily functions, or behaviour are under the control of another person or other external force instead of under one's own control. These experiences may or may not be accompanied by a delusional belief that provides an explanation for the subjective experience. [1]

• MB26.2 Grandiosity

  Exaggerated self-esteem or an unrealistic belief in one's superiority, importance, capacities, or identity. [1]

• MB26.3 Homicidal ideation

  Thoughts, ideas, or ruminations about killing another person, which range from vague ideas of revenge to detailed and fully formulated plans but do not include actual homicidal attempts. [1]

• MB26.4 Identity disturbance

  Distortion or inconsistency in the sense or view of sameness and historical continuity of one's self. [1]

• MB26.5 Obsessions

  Repetitive and persistent thoughts (e.g., of contamination), images (e.g., of violent scenes), or impulses/urges (e.g., to stab someone) that are experienced as intrusive, unwanted, and are commonly associated with anxiety. [1]

• MB26.6 Overvalued ideas

  Unreasonable and sustained beliefs that are maintained with less than delusional intensity (i.e., the person is able to acknowledge the possibility that the belief may not be true). An alternative use of this term is to refer to conventional or plausible thoughts (e.g., religious concepts, political ideas, or excessively idealistic beliefs) that are held with such a level of intensity so that the person's life is taken up by them. [1]

• MB26.7 Paranoid ideation

  Ideation, not held with delusional intensity, involving suspiciousness or beliefs of being harassed, persecuted, or unfairly treated by others. [1]

• MB26.8 Referential thinking

  Ideation, not held with delusional intensity, that random or coincidental events are of particular and unusual significance to the person. [1]

• MB26.9 Suspiciousness

  The behaviour of others is viewed with anxiety, mistrust, or hostility and perceived as potentially threatening. [1]

• MB26.A Suicidal ideation

  Thoughts, ideas, or ruminations about the possibility of ending one's life, ranging from thinking that one would be better off dead to formulation of elaborate plans. [1]

References

1. World Health Organization. International Classification of Diseases, 11th Revision, for Mortality and Morbidity Statistics (ICD-11 MMS), 2026-01 release. World Health Organization; 2026.

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