Explain medico legal classification of insanity. Fmt Rajesh text book

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Medico-Legal Classification of Insanity

(The Essentials of Forensic Medicine and Toxicology, 36th Edition - Rajesh, Chapter 23)

What is Insanity?

The word insanity has no precise technical meaning in law or medicine. It does not connote any definite medical entity but is solely a legal and sociological concept used to designate those members of society who, on account of mental disease, are unable to adapt themselves to ordinary social requirements - so that the community compulsorily segregates them and takes away their rights as citizens.

Insanity is a degree of mental disturbance and is seen as a form of social inadequacy.
The term "unsoundness of mind" appears in the IPC and is used as a synonym with other terms like insanity, lunacy, madness, and mental derangement - referring to a condition due to which the individual loses the power of regulating his actions and conduct according to the rules of society.
A person may be considered, from a legal point of view, to be immune from certain responsibilities and may be disallowed certain privileges that require competence, such as the ability to marry, make contracts, or manage property.

Medico-Legal Classification of Mental Diseases (Insanity)

The WHO International Classification of Diseases (ICD-1992), as adopted in the Rajesh textbook, classifies mental illness (insanity) as follows:

(A) Organic Mental Disorders

Dementia in Alzheimer's disease
Vascular dementia and dementia in other diseases
Organic amnesic syndrome
Delirium (not induced by alcohol)
Mental, personality, and behavioral disorders due to brain disease, damage, or dysfunction

(B) Mental and Behavioral Disorders Due to Psychoactive Substance Use

Disorders caused by alcohol, opioids, cannabis, sedatives, cocaine, stimulants, hallucinogens, tobacco, etc.

(C) Schizophrenia

(D) Mood Disorders

Mania, depressive illness, bipolar disorders

(E) Neurotic, Stress-Related, and Somatoform Disorders

Anxiety disorders
Obsessive-compulsive disorder
Reaction to stress and adjustment disorders
Dissociative (conversion) disorder
Somatoform disorders

(F) Behavioral Syndromes Associated with Physiological Disturbances and Physical Factors

Eating disorders
Nonorganic sleep disorders
Sexual dysfunction not caused by organic disorder or disease
Mental and behavioral disorders associated with puerperium
Abuse of non-dependence-producing substances

(G) Personality Disorders

Specific personality disorders
Habit and impulse disorders
Gender identity disorders
Disorders of sexual perversion

(H) Mental Retardation (Oligophrenia/Amentia)

Earlier classified as:

Category	IQ Range	Description
Idiot	0-20	Defective mental development since birth/early childhood; may have physical abnormalities like microcephaly or mongolism
Imbecile	20-50	Defective development of brain from birth/early childhood; not capable of being taught
Moron (Feeble-minded)	50-75	Mental development of a child aged 6-11 years; requires constant care and supervision

(Note: The term "mental retardation" is now used instead of amentia/oligophrenia, and includes mental sub-normality and mental handicap. IQ is assessed by the Binet-Simon test, where normal adult IQ = 90-110.)

(I) Disorders of Psychological Development

Additional Medico-Legal Sub-classifications Within Insanity

1. Psychoses (True Insanity)

Withdrawal from reality; the person lives in a world of fantasy.
Progressive deterioration in personality and loss of contact with reality.
Incorrectly evaluates perceptions and makes incorrect inferences about external reality even against evidence.
Delusions and hallucinations are common.
Caused by alcohol, heroin, morphine, cannabis, cocaine, LSD (chronic use), epilepsy, cerebral tumors, cerebral trauma, pregnancy/childbirth.

2. Neuroses

Feature	Psychosis	Neurosis
Nature	Disease entity with physical/genetic basis	Reaction to stress/adverse childhood
Severity	Major	Minor
Empathy	Absent	Present
Contact with reality	Absent	Present
Insight	Absent	Present

3. Psychopathy (Antisocial Personality Disorder)

Types:

Predominantly aggressive
Predominantly inadequate (in education, training, behavior)
Predominantly moral and mental deficiency

Characteristic: No abnormality of thought, mood, or intelligence - but behavior is socially unacceptable. Failure of maturation of personality; lack of conscience, remorse, or guilt.

Lucid Interval (Medico-legally important)

A lucid interval is a period occurring in insanity during which all symptoms of insanity disappear completely. The individual is able to judge his acts soundly and becomes legally liable for his acts during this period.

Feature	Insanity	Head Injury
History	Of insanity present	Of injury to the head
Preceding symptoms	Of insanity	Of concussion
Following symptoms	Of insanity	Of cerebral irritation and compression
Occurrence	Frequent	Only once

Lucid intervals are common in mania and melancholia.
If an offence is committed, the person cannot be completely held responsible because it is very difficult to know whether he was suffering from mental abnormality at the time of the offence.

Causes of Insanity (Rajesh Classification)

Hereditary conditions - Huntington's chorea, amaurotic familial idiocy
Environmental factors - Faulty parental attitude, lack of mental hygiene
Psychogenic causes - Repression of mental conflicts
Organic diseases - Head injury, senile degeneration, atherosclerosis, myxedema
Drugs - Alcohol, cocaine, hashish, opium
Insanity of pregnancy and childbirth

Source: The Essentials of Forensic Medicine and Toxicology, 36th Edition (2026), Chapter 23 - Mental Diseases

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