Please use the index below to access the condition you require information on. It may take longer to find what you are looking for this way compared with our "search this site" facility in the navigator on the left but we try to point you in the most appropriate direction using this index and therefore the results should be better. For speed, this index has been split into separate alphabetical files:

Contact a Family also has information on many other specific conditions and rare disorders. If you cannot find the information you require in The Contact a Family Directory Online, you may wish to use our Contact a Family Helpline service.

MAD see Fatty Acid Oxidation Disorders
MCAD see Fatty Acid Oxidation Disorders
M-CMTC syndrome
MDA see Purine & Pyrimidine Metabolic diseases
MDC1A see Congenital Muscular Dystrophy
MDC1C see Congenital Muscular Dystrophy
MDS see Lissencephaly
ME see Chronic Fatigue syndrome / Myalgic Encephalopathy
MEB see Congenital Muscular Dystrophy and Lissencephaly
MED see Perthes disease
MELAS see Metabolic diseases and see Mitochondrial Cytopathies and related disorders
MEN I see Multiple Endocrine Neoplasia Type I
MEN II see Multiple Endocrine Neoplasia Type II
MEN IIA see Multiple Endocrine Neoplasia Type II
MEN IIB see Multiple Endocrine Neoplasia Type II
MERRF see Mitochondrial Cytopathies and related disorders
MG see Myasthenia Gravis and other Myasthenic syndromes
MH see Malignant Hyperthermia
MICS see Aicardi-Goutières syndrome
ML I see Mucopolysaccharide diseases and associated diseases
ML II see Mucopolysaccharide diseases and associated diseases
ML III see Mucopolysaccharide diseases and associated diseases
ML IV see Mucopolysaccharide diseases and associated diseases
MMD see Moya Moya disease
MNGIE see Mitochondrial Cytopathies and related disorders
MODY see Diabetes - Maturity Onset Diabetes of the Young
MOP see Fibrodysplasia Ossificans Progressiva
MOPD II see Majewski Osteodysplastic Primordial Dwarfism Type II
MPHD see Growth Hormone Deficiency
MPS I see Mucopolysaccharide diseases and associated diseases
MPS II see Mucopolysaccharide diseases and associated diseases
MPS III see Mucopolysaccharide diseases and associated diseases
MPS IV see Mucopolysaccharide diseases and associated diseases
MPS VI see Mucopolysaccharide diseases and associated diseases
MPS VII see Mucopolysaccharide diseases and associated diseases
MS see Multiple Sclerosis
MSA see Multiple System Atrophy
MTAP see Purine & Pyrimidine Metabolic diseases
MURCS see Klippel-Feil syndrome
Macrocephaly - Cutis Marmorata Telangiectasia Congenita syndrome see M-CMTC syndrome
Macrocephaly, Multiple Lipomas and Haemangioma see Bannayan-Riley-Ruvalcaba syndrome
Macular degeneration see Macular disease
Macular disease
Macular Dystrophy see Macular disease
Majewski Osteodysplastic Primordial Dwarfism Type II
Male balding see Alopecia
Male pattern hair loss see Alopecia
Male Pseudo-Hermaphroditism see Androgen Insensitivity syndrome
Malignant Atrophic Papulosis see Degos disease
Malignant Histiocytosis see Histiocytosis
Malignant Hyperpyrexia see Malignant Hyperthermia
Malignant Hyperthermia
Mandibulo Dysostosis see Treacher Collins syndrome
Manic depression see Bipolar disorder
Mannosidosis see Mucopolysaccharide diseases and associated diseases
Maple Syrup Urine disease see Organic Acidaemias
Marfan syndrome
Marinesco-Garland Syndrome see Marinesco-Sjögren Syndrome
Marinesco-Sjögren Syndrome
Marinesco-Sjögren-Garland Syndrome see Marinesco-Sjögren Syndrome
Maroteaux Lamy see Mucopolysaccharide diseases and associated diseases
Mastocytosis
McArdle disease see Glycogen Storage diseases
McCune-Albright syndrome
McLeod Neuroacanthocytosis syndrome see Neuroacanthocytosis disorders
McLeod syndrome see Neuroacanthocytosis disorders
Mediterranean Anaemia see Thalassaemia Major (ß Thalassaemia)
Medium-chain acyl-CoA dehydrogenase (MCAD) deficiency see Fatty Acid Oxidation Disorders Medulloblastomas see Brain Tumours
Meige syndrome see Dystonia
Melnick-Needles syndrome
Melorheostosis
Membranous Nephropathy see Glomerulonephritis and Nephrotic syndrome
Ménière's disease
Meniere's disease see Ménière's disease
Meningitis
Meningoencephalitis see Encephalitis
Menkes see Metabolic diseases
Mental Health
Mental Handicap see Learning Disability
Metachromatic Leukodystrophy see Metabolic diseases
Metabolic diseases
Metatarsus Adductus see Lower Limb abnormalities
Methionine Adenosyl Transferase see Metabolic diseases
Methionine Synthetase Deficiency see Metabolic diseases
Methylenetetrahydrofolate Reductase Deficiency see Metabolic diseases
Methylmalonic Aciduria see Organic Acidaemias
Methylthioadenosine Phosphorylase Deficiency see Purine & Pyrimidine Metabolic diseases
Microcephaly
Microcephaly-intracranial calcification syndrome see Aicardi-Goutières syndrome
Microlissencephaly see Cortical malformations
Microphthalmia see Anophthalmia
Microphthalmus see Coloboma
Migraine
Miller-Dieker syndrome see Cortical malformations
Miller-Fisher syndrome see Guillain-Barré syndrome
Milroy disease see Lymphoedema
Minimal Change disease see Nephrotic syndrome
Mitochondrial Complex I see Metabolic diseases
Mitochondrial Complex 2/3 see Metabolic diseases and see Mitochondrial Cytopathies and related disorders
Mitochondrial Cytopathies and related disorders
Mitochondrial DNA Mutations see Mitochondrial Cytopathies and related disorders
Mitochondrial Deficiency see Metabolic diseases
Mitochondrial diseases see Mitochondrial Cytopathies and related disorders
Mitochondrial Encephalomyopathy see Metabolic diseases and see Mitochondrial Cytopathies and related disorders
Mitochondrial Fatty Oxidase Disorders see Mitochondrial Cytopathies and related disorders
Mitochondrial mi (maternal inheritance) DNA see Metabolic diseases and see Mitochondrial Cytopathies and related disorders
Mitochondrial Myopathy see Mitochondrial Cytopathies and related disorders and see Muscular Dystrophy and neuromuscular disorders
Mitochondrial Myopathy, Encephalopathy, Lactic Acidosis and Mitoketothiolase Deficiency see Metabolic diseases
Möbius syndrome see Moebius syndrome
Moebius syndrome
Molybdenum co-factor Deficiency see Metabolic diseases
Molybdenum co-factor deficiency - Combined XOD/sulphate oxidase deficiency see Purine & Pyrimidine Metabolic diseases
Mononeuritis multiplex see Peripheral Neuropathy
Mononeuropathy see Peripheral Neuropathy
Monosomy X see Turner syndrome
Morquio see Mucopolysaccharide diseases and associated diseases
Morris's syndrome see Androgen Insensitivity syndrome
Motor Impairment see Cerebral Palsy
Motor Neurone disease
Mowat-Wilson syndrome
Moya Moya disease
Moyamoya disease see Moya Moya disease
Mucocutaneous Lymph Node syndrome see Kawasaki disease
Mucolipidosis see Mucopolysaccharide diseases and associated diseases
Mucopolysaccharide diseases and associated diseases
Mucosal Neuroma syndrome see Multiple Endocrine Neoplasia Type II
Muenke syndrome see Craniofacial Conditions
Multi-Infarct Dementia see Dementias
Multicystic encephalomalacia see Hydranencephaly
Multiple Acyl-CoA Dehydrogenase (MAD) deficiency (= Glutaric aciduria type II, GA II) see Fatty Acid Oxidation Disorders
Multiple Births see Twins with Special Needs/Multiple Births
Multiple Carboxylase Deficiency see Metabolic diseases
Multiple Endocrine Neoplasia Type I
Multiple Endocrine Neoplasia Type II
Multiple Epiphyseal dysplasia
Multiple Hamartoma syndrome see Cowden disease
Multiple Myeloma see Leukaemia and other allied blood disorders
Multiple Osteochondromatosis see Hereditary Multiple Exostoses
Multiple Pituitary Hormone Deficiency see Growth Hormone Deficiency
Multiple Sclerosis
Multiple Sulphatase Deficiency see Mucopolysaccharide diseases and associated diseases
Multiple System Atrophy
Muscle-Eye-Brain disease see Cortical malformations
Muscular Dystrophy and neuromuscular disorders
Muscular Sub-Aortic Stenosis see Cardiomyopathies
Myalgic Encephalomyelitis see Chronic Fatigue syndrome / Myalgic Encephalopathy
Myasthenia Gravis and other Myasthenic syndromes
Myasthenic-Myopathic syndrome see Myasthenia Gravis and other Myasthenic syndromes
Mycoplasma encephalitis see Encephalitis
Myoadenylate Deaminase see Purine & Pyrimidine Metabolic diseases
Myoclonic Encephalopathy see Dancing Eye syndrome
Myoclonic Epilepsy and Ragged-Red Fibre's see Mitochondrial Cytopathies and related disorders
Myoneurogastrointestinal Disorder and Encephalopathy see Mitochondrial Cytopathies and related disorders
Myopia see Vision Disorders in Childhood
Myositis see Dermatomyositis and Polymyositis
Myositis Ossificans Progressiva see Fibrodysplasia Ossificans Progressiva
Myotonia Congenita see Muscular Dystrophy and neuromuscular disorders
Myotonic Dystrophy/Congenital Myotonic Dystrophy
Myotubular Myopathy