Mental health

Mild personality disorder

Mild personality disorder (ICD-11 6D10.0) is the lowest severity level of personality disorder in ICD-11, above personality difficulty, aligned with DSM-5 AMPD level 2 moderate impairment, typically with one trait qualifier.

Military sexual trauma

Military sexual trauma (MST) is the VA term for sexual assault or sexual harassment during military service. About 1 in 3 women and 1 in 50 men screened in VA report it; free MST-related care and disability compensation are available.

Mind

Mind (National Association for Mental Health) is the mental health charity for England and Wales, founded 1946, charity no. 219830, running the Infoline 0300 123 3393, a federation of ~100 local Minds, and campaigns; distinct from Mind Sweden and Mind Australia.

Mindfulness-based cognitive therapy

Mindfulness-based cognitive therapy (MBCT) is an eight-session group psychotherapy combining mindfulness meditation with cognitive therapy, developed in the 1990s to prevent depressive relapse in recurrent depression.

Mini–mental state examination

Mini–mental state examination (MMSE), 30-point bedside cognitive screening test published by Folstein and colleagues in 1975; pooled sensitivity and specificity about 0.89 for dementia, weaker for MCI, affected by education and language.

Minority stress

Minority stress: excess stress on people in stigmatized social categories, theorized by Virginia Brooks (1981) and integrated by Ilan Meyer (2003) to explain LGBTQ+ mental health disparities via distal and proximal stressors.

Misidentification delusion

A misidentification delusion is a fixed, false belief about the identity of people, places, or objects, typically that familiar people have been replaced by identical-looking impostors.

Mixed depressive and anxiety disorder

Mixed depressive and anxiety disorder is an ICD-11 mood disorder (code 6A73) in which anxiety and depression symptoms coexist for two weeks or more, each below the threshold for a separate diagnosis.

MoCA-B Turkish study

MoCA-B Turkish study (NCT07630688): a completed cross-sectional validation of the Turkish Montreal Cognitive Assessment-Basic in 166 low-education adults at Antalya Training and Research Hospital, finding AUC 0.891 for MCI (cut-off 21) and 0.992 for dementia (cut-off 18).

Moclobemide

Moclobemide (Ro 11-1163, Aurorix) is a reversible, selective MAO-A inhibitor (RIMA) antidepressant synthesized in 1972, launched in Europe in 1992, never US-approved, dosed 300-600 mg/day.

Moderate personality disorder

Moderate personality disorder (ICD-11 6D10.1) is the middle severity level of the single ICD-11 personality disorder diagnosis, marked by disturbances in multiple areas of self and interpersonal functioning, specified by five trait domains and a borderline pattern qualifier.

Molecular Psychiatry

Molecular Psychiatry (Mol Psychiatry) is a monthly Springer Nature peer-reviewed journal founded in 1996 by Julio Licinio and Ma-Li Wong, covering biological mechanisms of psychiatric disorders; 2025 impact factor 10.4, ISSN 1359-4184.

Montgomery–Åsberg Depression Rating Scale

The Montgomery–Åsberg Depression Rating Scale (MADRS) is a ten-item, clinician-rated interview measuring depression severity on a 0–60 scale. Designed by Montgomery and Åsberg in 1979, it is the standard endpoint in antidepressant trials.

Montreal Cognitive Assessment

Montreal Cognitive Assessment (MoCA), a 10-minute cognitive screening test developed by Ziad Nasreddine in 1996, published 2005; detects mild cognitive impairment, cutoff below 26/30, more sensitive than MMSE, education-adjusted cutoffs vary widely.

Mood disorder

Mood disorder: group of mental health conditions, mainly depressive disorders (major depression, dysthymia) and bipolar disorders (bipolar I, II, cyclothymia), defined by persistent or episodic disturbance of mood, with DSM-5/ICD classification, genetic and environmental causes, and psychotherapy, medication, and brain stimulation treatments.

Mood Disorder Questionnaire

The Mood Disorder Questionnaire (MDQ) is a brief self-report screening tool for bipolar disorder, developed by Robert Hirschfeld and colleagues and introduced in 2000. It has 13 yes/no symptom items and takes about five minutes.

Mood swing

Mood swings are sudden mood changes driven by shifting neurotransmitter levels, common in adolescence, pregnancy, and menopause, and caused by conditions like thyroid disease, PMDD, sleep loss, or bipolar disorder.

Moral injury

Moral injury is lasting psychological harm from committing, witnessing, or being victimized by acts that violate deeply held moral beliefs, first described in military veterans.

Mortality of autistic individuals

Mortality of autistic individuals: people with autism spectrum disorder die at about 2.4 times the general-population rate, with elevated suicide risk (RR 2.85, over 5 without intellectual disability), higher female risk, and life expectancy deficits of roughly 6 to 15 years in diagnosed groups.

Oct 15, 2026

Motivational Enhancement Therapy

Motivational Enhancement Therapy (MET) is a brief, four-session psychotherapy for substance use disorders that uses motivational interviewing and personalized assessment feedback, developed for Project MATCH.

Motivational interviewing

Motivational interviewing (MI) is a client-centered counseling style, first described by William Miller in 1983 and codified with Stephen Rollnick, that resolves ambivalence to change behavior; Cochrane evidence shows short-term benefit versus no intervention but little difference versus active treatments.

Multisystemic therapy

Multisystemic therapy (MST) is an intensive, home-based psychotherapy for adolescents ages 12 to 17 with serious antisocial behavior, treating the family, school, and peers together.

Muscle dysmorphia

Muscle dysmorphia (bigorexia, reverse anorexia) is a pathological preoccupation with insufficient muscularity, classified as a body dysmorphic disorder specifier in DSM-5 and ICD-11, with prevalence around 7 to over 17 percent in weightlifting samples.

My Strange Addiction

My Strange Addiction: TLC reality series (premiered December 29, 2010, revived January 7, 2026) profiling unusual compulsions and fixations, from pica to trichotillomania, with expert commentary and staged interventions.

Mysophobia

Mysophobia (germaphobia), morbid fear of contamination, coined by Hammond in 1879; classified as a specific phobia, often co-occurring with contamination OCD, treated with exposure and response prevention.

Nail biting

Nail biting (onychophagia) is a body-focused repetitive behavior affecting 20-30% of people, classified in DSM-5-TR under other specified obsessive-compulsive and related disorders, treated mainly with habit reversal training and bitter polish.

Naloxone

Naloxone, also known as Narcan, is an opioid antagonist medication that rapidly reverses opioid overdoses; a nasal spray was approved over the counter in 2023.

Naltrexone

Naltrexone, an opioid antagonist (Revia, Vivitrol), blocks mu-opioid receptors; FDA approved 1984 for opioid addiction, 1994 oral and 2006 injectable for alcohol use disorder, reducing craving and heavy drinking.

Narcissistic parent

Narcissistic parent: a cultural term for parents with excessive needs for admiration or importance, distinct from narcissistic personality disorder (NPD), a DSM-5 diagnosis affecting roughly 1–6% of adults and linked to insecure attachment, low self-esteem, anxiety, and depression in children.