List of diseases (M)

This is a list of diseases starting with the letter "M".

Diseases
Alphabetical list

* 0–9
* A
* B
* C
* D
* E
* F
* G

* I
* J
* K
* L
* M
* N
* O
* P
* Q

* S
* T
* U
* V
* W
* X
* Y
* Z

See also

Health
Exercise
Nutrition

## Ma[edit]

* Mac
* Mad–Mak
* Mal
* Man
* Mar
* Mas–May

### Mac[edit]

* Mac Dermot Patton Williams syndrome
* Mac Dermot Winter syndrome

#### Maci–Macr[edit]

* Macias–Flores–Garcia–Cruz–Rivera syndrome
* Mackay–Shek–Carr syndrome
* Macleod–Fraser syndrome
* Macrocephaly cutis marmorata telangiectatica
* Macrocephaly dominant type
* Macrocephaly mental retardation facial dysmorphism
* Macrocephaly mesodermal hamartoma spectrum
* Macrocephaly mesomelic arms talipes
* Macrocephaly pigmentation large hands feet
* Macrocephaly short stature paraplegia
* Macrodactyly of the foot
* Macrodactyly of the hand
* Macroepiphyseal dysplasia Mcalister Coe type
* Macroglobulinemia
* Macroglossia dominant
* Macroglossia exomphalos gigantism
* Macrogyria pseudobulbar palsy
* Macrophagic myofasciitis
* Macrosomia developmental delay dysmorphism
* Macrosomia microphthalmia cleft palate
* Macrothrombocytopenia progressive deafness
* Macrothrombocytopenia with leukocyte inclusions

#### Macu[edit]

* Macular corneal dystrophy
* Macular degeneration
* Macular degeneration juvenile
* Macular degeneration, age-related
* Macular degeneration, polymorphic
* Macular dystrophy, vitelliform
* Macules hereditary congenital hypopigmented and hyperpigmented

### Mad–Mak[edit]

* Mad cow disease
* Madelung's disease
* Madokoro–Ohdo–Sonoda syndrome
* Maffucci syndrome
* Maghazaji syndrome
* Magnesium defect in renal tubular transport of
* Magnesium wasting renal
* Major depressive disorder

### Mal[edit]

* Mal de debarquement

#### Mala–Mall[edit]

* Malakoplakia
* Malaria
* Male pseudohermaphroditism due to 17-beta-hydroxysteroid dehydrogenase deficiency
* Male pseudohermaphroditism due to 5-alpha-reductase 2 deficiency
* Male pseudohermaphroditism due to defective LH molecule
* Malformations in neuronal migration
* Malignant astrocytoma
* Malignant fibrous histiocytoma
* Malignant germ cell tumor
* Malignant hyperthermia arthrogryposis torticollis
* Malignant hyperthermia

* Malignant hyperthermia susceptibility type 1
* Malignant hyperthermia susceptibility type 2
* Malignant hyperthermia susceptibility type 3
* Malignant hyperthermia susceptibility type 4
* Malignant hyperthermia susceptibility type 5
* Malignant hyperthermia susceptibility type 6

* Malignant mesenchymal tumor
* Malignant mixed Müllerian tumor
* Malignant paroxysmal ventricular tachycardia
* Mallory–Weiss syndrome

#### Malo–Malp[edit]

* Malonic aciduria
* Malonyl-CoA decarboxylase deficiency
* Malouf syndrome
* Malpuech facial clefting syndrome

### Man[edit]

* Mandibuloacral dysplasia
* Mandibulofacial dysostosis deafness postaxial polydactyly
* Mandibulofacial dysostosis-microcephaly syndrome
* Manic Depression, Bipolar
* Manic-depressive psychosis, genetic types
* Mannosidosis
* Manouvrier syndrome
* Mansonelliasis
* Mantle cell lymphoma

### Mar[edit]

#### Mara–Marg[edit]

* Marashi–Gorlin syndrome
* Marburg fever
* Marchiafava–Bignami disease
* Marchiafava–Micheli disease
* Marcus Gunn phenomenon
* Marden–Walker-like syndrome
* Marden–Walker syndrome
* Marek disease
* Marfan syndrome
* Marfan Syndrome type II
* Marfan Syndrome type III
* Marfan Syndrome type IV
* Marfan Syndrome type V
* Marfan-like syndrome, Boileau type
* Marfan-like syndrome
* Marfanoid craniosynostosis syndrome
* Marfanoid hypermobility
* Marfanoid mental retardation syndrome autosomal
* Marginal glioneuronal heterotopia

#### Mari–Mart[edit]

* Marie type ataxia
* Marie–Unna congenital hypotrichosis
* Marinesco–Sjögren like syndrome
* Marinesco–Sjögren syndrome
* Marion–Mayers syndrome
* Markel–Vikkula–Mulliken syndrome
* Marles–Greenberg–Persaud syndrome
* Marker chromosome 15 syndrome
* Maroteaux–Cohen–Solal–Bonaventure syndrome
* Maroteaux–Fonfria syndrome
* Maroteaux–Le Merrer–Bensahel syndrome
* Maroteaux–Stanescu–Cousin syndrome
* Maroteaux–Verloes–Stanescu syndrome
* Maroteaux–Lamy syndrome
* Marphanoid syndrome type De Silva
* Marsden–Nyhan–Sakati syndrome
* Marsden syndrome
* Marshall syndrome
* Marshall–Smith syndrome
* Martinez–Monasterio–Pinheiro syndrome
* Martsolf–Reed–Hunter syndrome
* Martsolf syndrome

### Mas–May[edit]

* MASA syndrome
* Mass psychogenic illness
* MASS syndrome
* Massa–Casaer–Ceulemans syndrome
* Mast cell disease
* Mastocytosis, short stature, hearing loss
* Mastocytosis
* Mastoiditis
* Mastroiacovo–De Rosa–Satta syndrome
* Mastroiacovo–Gambi–Segni syndrome
* MAT deficiency
* Maternal hyperphenylalaninemia
* Maternally inherited diabetes and deafness
* Mathieu–De Broca–Bony syndrome
* Matsoukas–Liarikos–Giannika syndrome
* Matthew–Wood syndrome
* Maturity onset diabetes of the young
* Maumenee syndrome
* Maxillary double lip
* Maxillofacial dysostosis
* Maxillonasal dysplasia, Binder type
* Mayer–Rokitanski–Kuster syndrome
* May–Hegglin anomaly

## Mc[edit]

* McAlister–Crane syndrome
* McArdle disease
* McCallum–Macadam–Johnston syndrome
* McCune–Albright syndrome
* McDonough syndrome
* McDowall syndrome
* McGillivray syndrome
* McKusick–Kaufman syndrome
* McKusick type metaphyseal chondrodysplasia
* McLain–Debakian syndrome
* McPherson–Clemens syndrome
* McPherson–Robertson–Cammarano syndrome

## Me[edit]

* Mea–Med
* Meg–Mei
* Mel–Mem
* Men
* Mer–Mes
* Met
* Mev–Mey

### Mea–Med[edit]

* Meacham–Winn–Culler syndrome
* Meadows syndrome, names for:
* Munchausen syndrome by proxy
* Peripartum cardiomyopathy
* Measles
* Meckel like syndrome
* Meckel syndrome
* Medeira Dennis Donnai syndrome
* Median cleft lip corpus callosum lipoma skin polyps
* Median nodule of the upper lip
* Mediastinal endodermal sinus tumors
* Mediastinal syndrome
* Mediterranean fever
* Medium-chain Acyl-CoA dehydrogenase deficiency
* Medrano Roldan syndrome
* Medullary cystic disease
* Medullary thyroid carcinoma
* Medulloblastoma

### Meg–Mei[edit]

* Megacystis microcolon intestinal hypoperistalsis syndrome
* Megaduodenum
* Mega-epiphyseal dwarfism
* Megalencephalic leukodystrophy
* Megalencephaly-cystic leukodystrophy
* Megaloblastic anemia
* Megalocornea mental retardation syndrome
* Megalocytic interstitial nephritis
* Mehes syndrome
* Mehta–Lewis–Patton syndrome
* Meier–Blumberg–Imahorn syndrome
* Meier–Rotschild syndrome
* Meige syndrome
* Meigel disease
* Meinecke–Pepper syndrome
* Meinecke syndrome

### Mel–Mem[edit]

* Melanoma type 1
* Melanoma type 2
* Melanoma, familial
* Melanoma, malignant
* Melanoma-astrocytoma syndrome
* Melanosis neurocutaneous
* MELAS
* Meleda disease
* Melhem–Fahl syndrome
* Melioidosis
* Melkersson–Rosenthal syndrome
* Melnick–Needles osteodysplasty
* Melnick–Needles syndrome
* Membranoproliferative glomerulonephritis (type II)

### Men[edit]

#### Mend–Meno[edit]

* Mendelian susceptibility to atypical mycobacteria
* Menetrier's disease
* Mengel–Konigsmark syndrome
* Ménière's disease
* Meningeal angiomatosis cleft hypoplastic left heart
* Meningioma 1
* Meningioma
* Meningitis, meningococcal
* Meningitis
* Meningocele
* Meningococcemia
* Meningoencephalocele
* Meningoencephalocele-arthrogryposis-hypoplastic thumb
* Meningomyelocele

#### Ment[edit]

##### Menta[edit]

###### Mental[edit]

Mental d – Mental m

* Mental deficiency-epilepsy-endocrine disorders
* Mental mixed retardation deafness clubbed digits

Mental r

* Mental retardation

Mental retardation a – Mental retardation m

* Mental retardation anophthalmia craniosynostosis
* Mental retardation arachnodactyly hypotonia telangiectasia
* Mental retardation athetosis microphthalmia
* Mental retardation blepharophimosis obesity web neck
* Mental retardation Buenos Aires type
* Mental retardation cataracts calcified pinnae myopathy
* Mental retardation coloboma slimness
* Mental retardation contractural arachnodactyly
* Mental retardation dysmorphism hypogonadism diabetes
* Mental retardation epilepsy bulbous nose
* Mental retardation epilepsy
* Mental retardation gynecomastia obesity X linked
* Mental retardation hip luxation G6PD variant
* Mental retardation hypocupremia hypobetalipoproteinemia
* Mental retardation hypotonia skin hyperpigmentation
* Mental retardation macrocephaly coarse facies hypotonia
* Mental retardation microcephaly phalangeal facial
* Mental retardation microcephaly unusual facies
* Mental retardation Mietens–Weber type
* Mental retardation multiple nevi
* Mental retardation myopathy short stature endocrine defect
* Mental retardation nasal hypoplasia obesity genital hypoplasia

Mental retardation n – Mental retardation s

* Mental retardation nasal papillomata
* Mental retardation osteosclerosis
* Mental retardation progressive spasticity
* Mental retardation psychosis macroorchidism
* Mental retardation short broad thumbs
* Mental retardation short stature absent phalanges
* Mental retardation short stature Bombay phenotype
* Mental retardation short stature cleft palate unusual facies
* Mental retardation short stature deafness genital
* Mental retardation short stature hand contractures genital anomalies
* Mental retardation short stature heart and skeletal anomalies
* Mental retardation short stature hypertelorism
* Mental retardation short stature microcephaly eye
* Mental retardation short stature ocular and articular anomalies
* Mental retardation short stature scoliosis
* Mental retardation short stature unusual facies
* Mental retardation short stature wedge shaped epiphyses
* Mental retardation skeletal dysplasia abducens palsy
* Mental retardation Smith–Fineman–Myers type
* Mental retardation spasticity ectrodactyly

Mental retardation u – Mental retardation x

* Mental retardation unusual facies Ampola type
* Mental retardation unusual facies Davis–Lafer type
* Mental retardation unusual facies talipes hand anomalies
* Mental retardation unusual facies
* Mental retardation Wolff type
* Mental retardation X linked Atkin type
* Mental retardation X linked borderline Maoa metabolism anomaly
* Mental retardation X linked Brunner type
* Mental retardation X linked dysmorphism
* Mental retardation X linked dystonia dysarthria
* Mental retardation X linked severe Gustavson type
* Mental retardation X linked short stature obesity
* Mental retardation X linked Tranebjaerg type seizures psoriasis
* Mental retardation, unexplained
* Mental retardation, X linked, Marfanoid habitus
* Mental retardation, X linked, nonspecific
* Mental retardation, X-linked 14
* Mental retardation-polydactyly-uncombable hair

### Mer–Mes[edit]

* Mercury poisoning (Mercurialism)
* Meretoja syndrome
* Merkle tumors
* Merlob–Grunebaum–Reisner syndrome
* Merlob syndrome
* Mesangial sclerosis, diffuse
* Mesenteric ischemia
* Mesenteric panniculitis
* Mesodermal defects lower type
* Mesomelia synostoses
* Mesomelia
* Mesomelic dwarfism cleft palate camptodactyly
* Mesomelic dwarfism Langer type
* Mesomelic dwarfism Nievergelt type
* Mesomelic dwarfism Reinhardt–Pfeiffer type
* Mesomelic dysplasia skin dimples
* Mesomelic dysplasia Thai type
* Mesomelic syndrome Pfeiffer type
* Mesothelioma

### Met[edit]

#### Meta[edit]

* Metabolic acidosis
* Metabolic disorder
* Metabolic syndrome X
* Metacarpals 4 and 5 fusion
* Metachondromatosis
* Metageria
* Metaphyseal anadysplasia
* Metaphyseal chondrodysplasia Schmid type
* Metaphyseal chondrodysplasia Spahr type
* Metaphyseal chondrodysplasia, others
* Metaphyseal dysostosis mental retardation conductive deafness
* Metaphyseal dysplasia maxillary hypoplasia brachydactyly
* Metaphyseal dysplasia Pyle type
* Metastatic Insulinoma
* Metatarsus adductus
* Metatropic dwarfism
* Metatropic dysplasia

#### Meth[edit]

* Methimazole antenatal infection
* Methionine adenosyltransferase deficiency
* Methyl mercury antenatal infection
* Methylcobalamin deficiency cbl G type
* Methylcobalamin deficiency, cbl E complementation type
* Methylenetetrahydrofolate reductase deficiency
* Methylmalonic acidemia with homocystinuria
* Methylmalonic acidemia
* Methylmalonic aciduria microcephaly cataract
* Methylmalonicacidemia with homocystinuria, cbl D
* Methylmalonicaciduria with homocystinuria, cbl F
* Methylmalonicaciduria, vitamin B12 unresponsive, mut-0
* Methylmalonyl-Coenzyme A mutase deficiency

### Mev–Mey[edit]

* Mevalonate kinase deficiency
* Mevalonicaciduria
* Meyenburg–Altherr–Uehlinger syndrome

## Mi[edit]

* Mib
* Mic
* Mid–Mir
* Mis–Mix

### Mib[edit]

* Mibies syndrome

### Mic[edit]

#### Mich–Mick[edit]

* Michelin tire baby syndrome
* Michels Caskey syndrome
* Michels syndrome
* Mickleson syndrome

#### Micr[edit]

##### Mircre[edit]

* Micrencephaly corpus callosum agenesis
* Micrencephaly olivopontocerebellar hypoplasia

##### Micro[edit]

* Micro syndrome

###### Microb[edit]

* Microbrachycephaly ptosis cleft lip

###### Microc[edit]

Microcephalic

* Microcephalic osteodysplastic primordial dwarfism
* Microcephalic primordial dwarfism Toriello type
* Microcephalic primordial dwarfism

Microcephaly

* Microcephaly

Microcephaly a – Microcephaly l

* Microcephaly albinism digital anomalies syndrome
* Microcephaly autosomal dominant
* Microcephaly brachydactyly kyphoscoliosis
* Microcephaly brain defect spasticity hypernatremia
* Microcephaly cardiac defect lung malsegmentation
* Microcephaly cardiomyopathy
* Microcephaly cervical spine fusion anomalies
* Microcephaly chorioretinopathy recessive form
* Microcephaly cleft palate autosomal dominant
* Microcephaly deafness syndrome
* Microcephaly developmental delay pancytopenia
* Microcephaly facial clefting preaxial polydactyly
* Microcephaly glomerulonephritis Marfanoid habitus
* Microcephaly hiatus hernia nephrotic syndrome
* Microcephaly hypergonadotropic hypogonadism short stature
* Microcephaly immunodeficiency lymphoreticuloma
* Microcephaly intracranial calcification
* Microcephaly lymphoedema chorioretinal dysplasia
* Microcephaly lymphoedema syndrome

Microcephaly m – Microcephaly w

* Microcephaly mental retardation retinopathy
* Microcephaly mental retardation spasticity epilepsy
* Microcephaly mesobrachyphalangy tracheoesophageal fistula syndrome
* Microcephaly microcornea syndrome Seemanova type
* Microcephaly micropenis convulsions
* Microcephaly microphthalmos blindness
* Microcephaly nonsyndromal
* Microcephaly pontocerebellar hypoplasia dyskinesia
* Microcephaly seizures mental retardation heart disorders
* Microcephaly sparse hair mental retardation seizures
* Microcephaly syndactyly brachymesophalangy
* Microcephaly with chorioretinopathy, autosomal dominant form
* Microcephaly with normal intelligence, immunodeficiency
* Microcephaly with spastic q­riplegia
* Microcephaly, holoprosencephaly, and intrauterine growth retardation
* Microcephaly, primary autosomal recessive

Microco

* Microcoria, congenital
* Microcornea correctopia macular hypoplasia
* Microcornea glaucoma absent frontal sinuses

###### Microd – Microv[edit]

* Microdontia hypodontia short stature
* Microencephaly
* Microgastria limb reduction defect
* Microgastria short stature diabetes
* Microinfarct
* Micromelic dwarfism Fryns type
* Micromelic dysplasia dislocation of radius
* Microphtalmos bilateral colobomatous orbital cyst
* Microphthalmia
* Microphthalmia, Lentz type
* Microphthalmia camptodactyly mental retardation
* Microphthalmia cataract
* Microphthalmia diaphragmatic hernia Fallot
* Microphthalmia mental deficiency
* Microphthalmia microtia fetal akinesia
* Microphthalmia with limb anomalies
* Microphthalmos, microcornea, and sclerocornea
* Microscopic polyangiitis
* Microsomia hemifacial radial defects
* Microspherophakia metaphyseal dysplasia
* Microsporidiosis
* Microtia, meatal atresia and conductive deafness
* Microvillus inclusion disease

#### Micu[edit]

* Miculicz syndrome

### Mid–Mir[edit]

* MIDAS syndrome
* Midline cleft of lower lip
* Midline defects autosomal type
* Midline defects recessive type
* Midline developmental field defects
* Midline field defects
* Midline lethal granuloma
* Mietens syndrome
* Mievis–Verellen–Dumoulin syndrome
* Migraine
* Mikulicz syndrome
* Mild cognitive impairment
* Miller Fisher syndrome
* Miller–Dieker syndrome
* Milner–Khallouf–Gibson syndrome
* MILS syndrome
* Minamata disease
* Minkowski–Chauffard syndrome
* Minoxidil antenatal infection
* Miosis, congenital
* Mirhosseini–Holmes–Walton syndrome
* Mirror hands feet nasal defects
* Mirror polydactyly segmentation and limbs defects

### Mis–Mix[edit]

* Mitochondrial cytopathy (generic term)
* Mitochondrial diseases of nuclear origin
* Mitochondrial diseases, clinically undefinite
* Mitochondrial disease
* Mitochondrial encephalomyopathy aminoacidopathy
* Mitochondrial genetic disorders
* Mitochondrial myopathy lactic acidosis
* Mitochondrial myopathy-encephalopathy-lactic acidosis
* Mitochondrial PEPCK deficiency
* Mitochondrial trifunctional protein deficiency
* Mitral atresia
* Mitral regurgitation deafness skeletal anomalies
* Mitral valve prolapse, familial, autosomal dominant
* Mitral valve prolapse, familial, X linked
* Mitral valve prolapse
* Miura syndrome
* Mixed connective tissue disease
* Mixed Müllerian tumor
* Mixed receptive-expressive language disorder
* Mixed sclerosing bone dystrophy

## Ml–Mn[edit]

* MLS syndrome
* MMEP syndrome
* MMT syndrome
* MN1
* MNGIE syndrome

## Mo[edit]

* Mob–Mom
* Mon–Moo
* Mor–Moy

### Mob–Mom[edit]

* Möbius syndrome
* MODY syndrome
* Möbius axonal neuropathy hypogonadism
* Moerman Van den berghe Fryns syndrome
* Moeschler–Clarren syndrome
* Mohr syndrome
* Mohr–Tranebjærg syndrome
* Mollica–Pavone–Antener syndrome
* Molluscum contagiosum
* Moloney syndrome
* Molybdenum cofactor deficiency
* MOMO syndrome

### Mon–Moo[edit]

* Mondini dysplasia
* Mondor's disease
* Monge's disease
* Monilethrix
* Monoamine oxidase A deficiency
* Monoclonal gammopathy of undetermined significance
* Monodactyly tetramelic
* Mononen–Karnes–Senac syndrome
* Mononeuritis multiplex
* Monosomy 8q12 21
* Monosomy 8q21 q22
* Monosomy X
* Montefiore syndrome
* Moore–Federman syndrome
* Moore–Smith–Weaver syndrome

### Mor–Moy[edit]

* Morel's ear
* Moreno–Zachai–Kaufman syndrome
* Morgani–Turner–Albright syndrome
* Morillo–Cucci–Passarge syndrome
* Morphea scleroderma
* Morphea, generalized
* Morquio disease, type A
* Morquio disease, type B
* Morquio syndrome
* Morrison–Young syndrome
* Morse–Rawnsley–Sargent syndrome
* Motor neuron disease
* Motor neuro-ophthalmic disorders
* Motor neuropathy peripheral dysautonomia
* Motor neuropathy
* Motor sensory neuropathy type 1 aplasia cutis congenita
* Mounier-Kuhn syndrome
* Mount–Reback syndrome
* Mousa Al din Al Nassar syndrome
* Moyamoya disease

## Mp–Mt[edit]

* MPO deficiency
* MPS III-A
* MPS III-B
* MPS III-C
* MPS III-D
* MPS VI
* MRKH Syndrome (Müllerian agenesis)
* MSBD syndrome
* MTHFR deficiency

## Mu[edit]

* Muc–Mue
* Mul
* Mum–Mut

### Muc–Mue[edit]

* Mucha–Habermann disease
* Muckle–Wells syndrome
* Mucoepithelial dysplasia
* Mucolipidosis type 1
* Mucolipidosis type 3
* Mucolipidosis type 4
* Mucopolysaccharidosis type 3
* Mucopolysaccharidosis type 4
* Mucopolysaccharidosis type I Hurler syndrome
* Mucopolysaccharidosis type I Hurler/Scheie syndrome
* Mucopolysaccharidosis type I Scheie syndrome
* Mucopolysaccharidosis type II Hunter syndrome- mild form
* Mucopolysaccharidosis type II Hunter syndrome- severe form
* Mucopolysaccharidosis type IV-A Morquio syndrome
* Mucopolysaccharidosis type IV-B
* Mucopolysaccharidosis type V
* Mucopolysaccharidosis type VI Maroteaux-Lamy - severe, intermediate
* Mucopolysaccharidosis type VII Sly syndrome
* Mucopolysaccharidosis
* Mucormycosis
* Mucosulfatidosis
* Muenke syndrome

### Mul[edit]

#### Muli–Mull[edit]

* Mulibrey nanism
* Müller–Barth–Menger syndrome
* Müllerian agenesis
* Müllerian aplasia
* Müllerian derivatives lymphangiectasia polydactyly
* Müllerian derivatives, persistent
* Müllerian duct abnormalities galactosemia
* Mulliez–Roux–Loterman syndrome

#### Mult[edit]

##### Multi[edit]

###### Multic–Multin[edit]

* Multicentric osteolysis nephropathy
* Multicentric reticulohistiocytosis
* Multifocal heterotopia
* Multifocal motor neuropathy
* Multifocal ventricular premature beats
* Multi-infarct dementia
* Multinodular goiter cystic kidney polydactyly

###### Multip[edit]

Multiple a – Multiple p

* Multiple acyl-CoA deficiency
* Multiple carboxylase deficiency, biotin responsive
* Multiple carboxylase deficiency, late onset
* Multiple carboxylase deficiency, propionic acidemia
* Multiple chemical sensitivity
* Multiple congenital anomalies mental retardation, growth failure and cleft lip palate
* Multiple congenital contractures
* Multiple contracture syndrome Finnish type
* Multiple endocrine neoplasia type 1
* Multiple endocrine neoplasia, type 2
* Multiple fibrofolliculoma familial
* Multiple hereditary exostoses
* Multiple joint dislocations metaphyseal dysplasia
* Multiple myeloma
* Multiple organ failure
* Multiple pterygium syndrome lethal type
* Multiple pterygium syndrome

Multiple s – Multiple v

* Multiple sclerosis ichthyosis factor VIII deficiency
* Multiple sclerosis
* Multiple subcutaneous angiolipomas
* Multiple sulfatase deficiency
* Multiple synostoses syndrome 1
* Multiple system atrophy
* Multiple vertebral anomalies unusual facies

### Mum–Mut[edit]

* Mumps
* Münchausen syndrome
* Münchausen syndrome by proxy
* Muscle-eye-brain syndrome
* Muscular atrophy ataxia retinitis pigmentosa diabetes mellitus
* Muscular dystrophy congenital infantile cataract hypogonadism
* Muscular dystrophy congenital, merosin negative
* Muscular dystrophy, facioscapulohumeral
* Muscular dystrophy Hutterite type
* Muscular dystrophy limb girdle type 2A, Erb type
* Muscular dystrophy limb-girdle autosomal dominant
* Muscular dystrophy limb-girdle type 2B, Myoshi type
* Muscular dystrophy limb-girdle with beta-sarcoglycan deficiency
* Muscular dystrophy limb-girdle with delta-sarcoglyan deficiency
* Muscular dystrophy white matter spongiosis
* Muscular dystrophy, congenital, merosin-positive
* Muscular dystrophy, Duchenne and Becker type
* Muscular dystrophy
* Muscular fibrosis multifocal obstructed vessels
* Muscular phosphorylase kinase deficiency
* Mutations in estradiol receptor

## My[edit]

* Mya–Myc
* Mye–Myi
* Myo
* Myx

### Mya–Myc[edit]

* Myalgia eosinophilia associated with tryptophan
* Myalgic encephalomyelitis
* Myasthenia gravis congenital
* Myasthenia gravis
* Myasthenia, familial
* Mycobacterium avium complex infection
* Mycoplasmal pneumonia
* Mycosis fungoides lymphoma
* Mycosis fungoides, familial
* Mycosis fungoides
* Mycositis fungoides

### Mye–Myi[edit]

* Myelinopathy
* Myelitis
* Myelocerebellar disorder
* Myelodysplasia
* Myelodysplastic syndromes
* Myelofibrosis, idiopathic
* Myelofibrosis
* Myelofibrosis-osteosclerosis
* Myeloid splenomegaly
* Myeloperoxidase deficiency
* Myhre–Ruvalcaba–Graham syndrome
* Myhre–Ruvalcaba–Kelley syndrome
* Myhre–School syndrome
* Myhre syndrome
* Myiasis

### Myo[edit]

#### Myoa–Myon[edit]

* Myoadenylate deaminase deficiency
* Myocarditis
* Myocardium disorder
* Myoclonic dystonia
* Myoclonic epilepsy
* Myoclonic epilepsy with ragged red fibres (MERRF syndrome)
* Myoclonic progressive familial epilepsy
* Myoclonus ataxia
* Myoclonus cerebellar ataxia deafness
* Myoclonus epilepsy partial seizure
* Myoclonus hereditary progressive distal muscular atrophy
* Myoclonus progressive epilepsy of Unverricht and Lundborg
* Myoclonus
* Myofibrillar lysis
* Myofibroblastic tumors
* Myoglobinuria dominant form
* Myoglobinuria recurrent
* Myoglobinuria
* Myoneurogastrointestinal encephalopathy syndrome

#### Myop[edit]

* Myopathy and diabetes mellitus
* Myopathy cataract hypogonadism
* Myopathy congenital multicore with external ophthalmoplegia
* Myopathy growth and mental retardation hypospadias
* Myopathy Hutterite type
* Myopathy mitochondrial cataract
* Myopathy Moebius Robin syndrome
* Myopathy ophthalmoplegia hypoacousia areflexia
* Myopathy tubular aggregates
* Myopathy with lactic acidosis and sideroblastic anemia
* Myopathy with lysis of myofibrils
* Myopathy, centronuclear
* Myopathy, desmin storage
* Myopathy, McArdle type
* Myopathy, myotubular
* Myopathy, X-linked, with excessive autophagy
* Myopathy
* Myophosphorylase deficiency
* Myopia
* Myopia, infantile severe
* Myopia, severe

#### Myor–Myot[edit]

* Myorhythmia
* Myositis ossificans post-traumatic
* Myositis ossificans progressiva
* Myositis ossificans
* Myositis, inclusion body
* Myositis
* Myotonia atrophica
* Myotonia mental retardation skeletal anomalies
* Myotubular myopathy

### Myx[edit]

* Myxedema
* Myxoid liposarcoma
* Myxoma-spotty pigmentation-endocrine overactivity
* Myxomatous peritonitis
* Myxozoa