25,729 articles
Meniscus root repair
Meniscus root repair is an arthroscopic technique that reattaches a torn meniscal root to its tibial insertion, most often the medial meniscus posterior root, introduced in 2006.
Menke-Hennekam syndrome
Menke-Hennekam syndrome (MKHK) is a rare autosomal dominant neurodevelopmental disorder caused by variants in CREBBP or EP300, first described in 2016 and distinct from Rubinstein-Taybi syndrome.
Menninger Foundation
Menninger Foundation, Topeka, Kansas psychiatric organization founded by the Menninger family; clinic 1919, sanitarium 1925, foundation 1941; moved to Houston with Baylor College of Medicine in 2002-2003.
Menopausal or female climacteric states
Menopausal or female climacteric states (ICD-11 GA30.00) is the diagnostic category for perimenopausal conditions such as cessation of menstruation, infertility, flushing, sleeplessness, headache, and poor concentration, also called climacteric syndrome or change of life.
Menopausal transition
Menopausal transition (perimenopause, ICD-11 GA30.01): the phase of irregular cycles and declining ovarian estrogen before menopause, staged by STRAW+10; typically begins ages 45-55, FSH >25 IU/L marks late transition.
Menopause
Menopause is the point when a woman's ovaries stop releasing eggs and producing estrogen and progesterone, ending her reproductive years, usually between 45 and 55.
Mens sana in corpore sano
Mens sana in corpore sano, 'a sound mind in a sound body', a Latin phrase from Juvenal's Satire X (line 356), originally a prayer for health over wealth or power, now a common motto and shorthand for the exercise-mental health link.
Menstrual cup
Menstrual cup: reusable bell-shaped silicone or latex device inserted in the vagina to collect menstrual flow; holds 10-38 mL, lasts up to 10 years, leakage similar or lower than pads or tampons.
Menstrual cycle
Menstrual cycle: the monthly hormonal process preparing the body for pregnancy, 21-35 days, ovulation mid-cycle, menstruation if no pregnancy; also called period, menses.
Menstrual Hygiene Products
Menstrual hygiene products (menstrual products, period products) are items such as tampons, pads, menstrual cups, discs, and period underwear used to absorb or collect menstrual fluid; FDA-regulated as medical devices in the US, with reusable cups showing the lowest environmental impact.
Menstrual pad
Menstrual pad (sanitary napkin): external absorbent product for menstrual fluid, disposable or reusable cloth. SAP-cored pads absorb 15-40 ml by spec; 10-20 used per cycle; FDA-regulated as devices; 500 million women lack access.
Menstrual synchrony
Menstrual synchrony, the McClintock effect, is the hypothesized convergence of menstrual cycles among women living together; reported in 1971, it lacks confirmed evidence and a verified pheromone mechanism.
Menstruation
Menstruation (menses, period): monthly shedding of the uterine lining through the vagina when pregnancy does not occur; cycles average 28 days (21–35), bleeding 3–7 days, from menarche to menopause.
Menstruation (mammal)
Menstruation (mammal): cyclic shedding of the uterine endometrium with bleeding, rare among mammals, occurring in higher primates, some bats, the elephant shrew, and the spiny mouse, driven by spontaneous decidualization and progesterone withdrawal.
Mental disorder
A mental disorder, also called a psychiatric or psychological disorder, is a clinically significant disturbance in cognition, emotion, or behavior, usually with distress or impairment; anxiety and depression are most common.
Mental health
Mental health: WHO defines it as well-being beyond absence of illness. About 1.2 billion people (1 in 7) live with a mental disorder; anxiety and depression dominate; treatment gap is severe, under 9% adequate depression care.
Mental health professional
Mental health professional: umbrella term for trained providers such as psychiatrists, psychologists, social workers, nurses, counselors, and peer workers; differs by degree, licensure, prescribing rights, and roles in care delivery.
Mental Health Services (concept)
Mental health services are organized services providing mental health care, MeSH descriptor D008605 since 1967. Covers deinstitutionalization history, community models such as community mental health centers and assertive community treatment, effectiveness evidence, and access barriers.
Mental Health Services (institution)
Mental Health Services of the Capital Region of Denmark (Region Hovedstadens Psykiatri): the Capital Region's psychiatric hospital organization, about 6,060 staff treating about 54,700 patients yearly across psychiatric centers, merged into the region's four acute hospitals on 1 January 2026.
Mental status examination
Mental status examination (MSE): structured clinical assessment of appearance, behavior, speech, mood and affect, thought, perception, and cognition. Uses bedside tests and screens such as MoCA and MMSE; attention is tested first.
MentalPlus® trial
MentalPlus® trial (NCT02551952), a completed University of São Paulo interventional trial validating the MentalPlus® digital game, a 25-minute neuropsychological assessment tool, against standardized tests for postoperative cognitive dysfunction in 163 surgical patients and volunteers.
Menthol cigarette
Menthol cigarette: cigarette flavored with menthol, first marketed as Spud in the 1920s and Kool in 1933; 37% of US cigarette sales in 2021, about 80% of Black US smokers use menthol, and a proposed FDA ban was postponed in 2024.
Menveo
Menveo (MenACWY-CRM) is a quadrivalent meningococcal conjugate vaccine against N. meningitidis serogroups A, C, W-135 and Y, developed by Novartis and made by GSK. FDA-licensed February 19, 2010 (ages 11–55, later 2 months–55 years), WHO prequalified 2013; oligosaccharides conjugated to CRM197.
Mepenzolate
Mepenzolate (Cantil, mepenzolate bromide) is a quaternary ammonium antimuscarinic antispasmodic, ATC A03AB12, FDA-approved November 14, 1956 and later discontinued; used in Japan for IBS and studied for COPD.
Mephedrone
Mephedrone (4-MMC, 4-methylmethcathinone), a synthetic cathinone stimulant sold as 'bath salts' or 'plant food'; acts at DAT, SERT, NET; UK Class B 2010, EU control 2010, UN control 2015.
Mephenaqualone
Mephenaqualone is a designer drug and analog of methaqualone, the 1960s sedative sold as Quaalude, with reported doses under 2 mg and no published pharmacology studies.
Mephenesin
Mephenesin (Tolserol, CAS 59-47-2), a centrally acting skeletal muscle relaxant introduced in 1948; short-acting spinal reflex depressant whose carbamate derivatives led to meprobamate.
Mephentermine
Mephentermine (Termin) is a sympathomimetic amine vasopressor, C11H17N, acting mainly by norepinephrine release; half-life 17-18 hours, approved 1951, used for spinal anesthesia hypotension, with amphetamine-type dependence risk.
Mephenytoin
Mephenytoin (Mesantoin), 3-methyl-5-ethyl-5-phenylhydantoin, a hydantoin anticonvulsant marketed since 1945 for partial and secondarily generalized seizures; metabolized to nirvanol, limited by idiosyncratic toxicity, and used as a CYP2C19 probe drug.
Mephobarbital
Mephobarbital (methylphenobarbital, Mebaral, Prominal) is an N-methyl barbiturate anticonvulsant and sedative introduced in 1932, metabolized to phenobarbital, Schedule IV, now discontinued in the US.