See Conditions by First Letter (M)
- Machado-Joseph Disease
- Macrophage Activation Syndrome
- Macular Degeneration
- Macular Edema
- Magnesium Deficiency
- Malabsorption Syndromes
- Malaria
- Malaria, Cerebral
- Malaria, Falciparum
- Malaria, Vivax
- Malformations of Cortical Development
- Malignant Carcinoid Syndrome
- Malignant Fibrous Histiocytoma
- Malignant Germ Cell Tumor
- Malignant Hyperthermia
- Malignant Mesenchymal Tumor
- Malignant Mesothelioma
- Malignant Mixed Mullerian Tumor
- Malignant Peripheral Nerve Sheath Tumor
- Malnutrition
- Malocclusion
- Malocclusion, Angle Class II
- Malocclusion, Angle Class III
- Malonyl-CoA Decarboxylase Deficiency
- Mandibular Fractures
- Mandibular Injuries
- Mannosidase Deficiency Diseases
- Mansonelliasis
- Mantle Cell Lymphoma
- Maple Syrup Urine Disease
- Marburg Hemorrhagic Fever
- Marburg Virus Disease
- Marfan Syndrome
- Marijuana Abuse
- Marijuana Smoking
- Mast-Cell Sarcoma
- Mastitis
- Mastocytoma
- Mastocytosis
- Mastocytosis, Cutaneous
- Mastocytosis, Systemic
- Mastoiditis
- Maternal Hyperphenylalaninemia
- Maturity-onset Diabetes of the Young
- Maxillary Diseases
- Maxillary Sinus Neoplasms
- Maxillary Sinusitis
- Maxillofacial Abnormalities
- Maxillofacial Injuries
- McCune Albright Syndrome
- Measles
- Meckel Syndrome
- Meconium Aspiration Syndrome
- Median Neuropathy
- Mediastinal Diseases
- Mediastinal Emphysema
- Mediastinal Neoplasms
- Mediastinitis
- Medullary Cystic Kidney Disease
- Medulloblastoma
- Medulloblastoma, Childhood
- Melanoma
- Melanoma, Experimental
- Melanoma, Familial
- Melanosis
- MELAS Syndrome
- Melena
- Meliodosis
- Melioidosis
- Membranoproliferative Glomerulonephritis Type 2
- Membranous Nephropathy
- Memory Disorders
- Menetrier Disease
- Meniere Disease
- Meningeal Carcinomatosis
- Meningeal Neoplasms
- Meningioma
- Meningitis
- Meningitis, Aseptic
- Meningitis, Bacterial
- Meningitis, Cryptococcal
- Meningitis, Fungal
- Meningitis, Haemophilus
- Meningitis, Meningococcal
- Meningitis, Pneumococcal
- Meningitis, Viral
- Meningococcal Infections
- Meningococcemia
- Meningomyelocele
- Menkes Disease
- Menkes Kinky Hair Syndrome
- Menopause
- Menopause, Premature
- Menorrhagia
- Menstruation Disturbances
- Mental Disorders
- Mental Disorders Diagnosed in Childhood
- Mental Fatigue
- Mental Retardation
- Mental Retardation, X-Linked
- Mercury Poisoning
- Merkel Cell Carcinoma
- Mesenchymoma
- Mesial Movement of Teeth
- Mesothelioma
- Metabolic Diseases
- Metabolic Syndrome X
- Metabolism, Inborn Errors
- Metachromatic Leukodystrophy
- Metal Metabolism, Inborn Errors
- Metaplasia
- Metastatic Squamous Neck Cancer With Occult Primary
- Metatarsalgia
- Methemoglobinemia
- Methionine Adenosyltransferase Deficiency
- Methylmalonic Acidemia
- Metrorrhagia
- Mevalonate Kinase Deficiency
- Mevalonic Aciduria
- Microcephaly
- Microencephaly
- Micrognathism
- Microphthalmos
- Microsatellite Instability
- Microscopic Polyangiitis
- Microsporidiosis
- Microvascular Angina
- Midline Lethal Granuloma
- Migraine Disorders
- Migraine with Aura
- Migraine without Aura
- Milk Hypersensitivity
- Miller Fisher Syndrome
- Milroy Disease
- Mineralocorticoid Excess Syndrome, Apparent
- Minimal Change Disease
- Miosis
- Mite Infestations
- Mitochondrial Diseases
- Mitochondrial Encephalomyopathies
- Mitochondrial Myopathies
- Mitochondrial Neurogastrointestinal Encephalopathy Syndrome
- Mitochondrial Trifunctional Protein Deficiency
- Mitral Valve Insufficiency
- Mitral Valve Prolapse
- Mitral Valve Stenosis
- Mixed Connective Tissue Disease
- Mixed Tumor, Mesodermal
- Mixed Tumor, Mullerian
- Miyoshi Myopathy
- Mobility Limitation
- Mobius Syndrome
- Molluscum Contagiosum
- Molybdenum Cofactor Deficiency
- Monckeberg Medial Calcific Sclerosis
- Mondini Dysplasia
- Mondor Disease
- Monkeypox
- Monoclonal Gammopathy of Undetermined Significance
- Mononeuropathies
- Monosomy
- Montefiore Syndrome
- Mood Disorders
- Morning Sickness
- Morphea
- Morphine Dependence
- Morquio Syndrome A
- Morvan's Fibrillary Chorea
- Motion Sickness
- Motor Neuro-ophthalmic Disorders
- Motor Neuron Disease
- Motor Skills Disorders
- Mouth Breathing
- Mouth Diseases
- Mouth Neoplasms
- Mouth, Edentulous
- Movement Disorders
- Moyamoya Disease
- Muckle-Wells Syndrome
- Mucocutaneous Lymph Node Syndrome
- Mucoepidermoid Carcinoma
- Mucolipidoses
- Mucopolysaccharidoses
- Mucopolysaccharidosis I
- Mucopolysaccharidosis II
- Mucopolysaccharidosis III
- Mucopolysaccharidosis IV
- Mucopolysaccharidosis Type I
- Mucopolysaccharidosis Type II
- Mucopolysaccharidosis Type III
- Mucopolysaccharidosis Type IIIA
- Mucopolysaccharidosis Type IIIB
- Mucopolysaccharidosis Type VI
- Mucopolysaccharidosis Type VII
- Mucopolysaccharidosis VI
- Mucopolysaccharidosis VII
- Mucormycosis
- Mucositis
- Muenke Syndrome
- Multicentric Castleman’s Disease
- Multicore Disease
- Multicystic Dysplastic Kidney
- Multifocal Choroiditis
- Multifocal Lymphangioendotheliomatosis With Thrombocytopenia
- Multiple Chemical Sensitivity
- Multiple Endocrine Neoplasia
- Multiple Endocrine Neoplasia Type 1
- Multiple Endocrine Neoplasia Type 2
- Multiple Endocrine Neoplasia Type 2a
- Multiple Endocrine Neoplasia Type 2b
- Multiple Myeloma
- Multiple Organ Failure
- Multiple Pulmonary Nodules
- Multiple Sclerosis
- Multiple Sclerosis, Chronic Progressive
- Multiple Sclerosis, Relapsing-Remitting
- Multiple System Atrophy
- Multiple System Atrophy (MSA) With Orthostatic Hypotension
- Multiple Trauma
- Mumps
- Muscle Cramp
- Muscle Eye Brain Disease
- Muscle Hypertonia
- Muscle Hypotonia
- Muscle Neoplasms
- Muscle Rigidity
- Muscle Spasticity
- Muscle Weakness
- Muscular Atrophy
- Muscular Atrophy, Spinal
- Muscular Diseases
- Muscular Disorders, Atrophic
- Muscular Dystrophies
- Muscular Dystrophies, Limb-Girdle
- Muscular Dystrophy, Duchenne
- Muscular Dystrophy, Facioscapulohumeral
- Muscular Dystrophy, Oculopharyngeal
- Musculoskeletal Abnormalities
- Musculoskeletal Diseases
- Mushroom Poisoning
- Mutism
- Myasthenia Gravis
- Myasthenic Syndromes, Congenital
- Mycobacterium Abscessus
- Mycobacterium Avium Complex
- Mycobacterium avium-intracellulare Infection
- Mycobacterium Infections
- Mycobacterium Infections, Atypical
- Mycobacterium Xenopi
- Mycoplasma Infections
- Mycoplasmal Pneumonia
- Mycoses
- Mycosis Fungoides
- Mydriasis
- Myelitis
- Myelitis, Transverse
- Myelodysplastic Syndromes
- Myelodysplastic-Myeloproliferative Diseases
- Myelodysplastic/myeloproliferative Disease
- Myelofibrosis
- Myelomeningocele
- Myeloproliferative Disorders
- MYH9 Related Thrombocytopenia
- Myocardial Infarction
- Myocardial Ischemia
- Myocardial Reperfusion Injury
- Myocardial Stunning
- Myocarditis
- Myoclonic Epilepsies, Progressive
- Myoclonic Epilepsy, Juvenile
- Myoclonus
- Myoclonus Epilepsy
- Myofascial Pain Syndromes
- Myofibroma
- Myoglobinuria
- Myokymia
- Myoma
- Myopathies, Nemaline
- Myopathies, Structural, Congenital
- Myopathy Congenital
- Myopathy, Central Core
- Myopia
- Myopia, Degenerative
- Myositis
- Myositis, Inclusion Body
- Myotonia
- Myotonia Atrophica
- Myotonia Congenita
- Myotonic Disorders
- Myotonic Dystrophy
- Myotonic Dystrophy Type 1
- Myotubular Myopathy
- Myxoid Liposarcoma
- Myxoma
- Myxopapillary Ependymoma