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

Ha

Hag–Ham

• Hageman factor deficiency
• Hagemoser–Weinstein–Bresnick syndrome
• Hailey–Hailey disease
• Hair defect with photosensitivity and mental retardation
• Hairy cell leukemia
• Hairy ears, y-linked
• Hairy ears
• Hairy nose tip
• Hairy palms and soles
• Hairy tongue
• Hajdu–Cheney syndrome
• Halal–Setton–Wang syndrome
• Halal syndrome
• Hall–Riggs mental retardation syndrome
• Hallermann–Streiff syndrome
• Hallervorden–Spatz disease (renamed to Pantothenate kinase-associated neurodegeneration due to Hallervorden's Nazi party associations)
• Hallucinogen persisting perception disorder
• Hallux valgus
• Hamanishi–Ueba–Tsuji syndrome
• Hamano–Tsukamoto syndrome
• Hamartoma sebaceus of Jadassohn

Han–Hay

• Hand and foot deformity flat facies
• Hand–foot–uterus syndrome
• Hand wringing Rett syndrome
• Hand, foot and mouth disease
• Hand–Schüller–Christian disease
• Hanhart syndrome
• Harding ataxia
• Harlequin type ichthyosis
• Harpaxophobia
• Harrod–Doman–Keele syndrome
• Hartnup disease
• Hartsfield–Bixler–Demyer syndrome
• Hashimoto struma
• Hashimoto–Pritzker syndrome
• Hashimoto's thyroiditis
• Haspeslagh–Fryns–Muelenaere syndrome
• Hay–Wells syndrome recessive type
• Hay–Wells syndrome

He

Hea–Hei

• Headache, cluster
• Hearing disorder
• Hearing impairment
• Hearing loss
• Heart aneurysm
• Heart attack
• Heart block progressive, familial
• Heart block
• Heart defect round face congenital retarded development
• Heart defect tongue hamartoma polysyndactyly
• Heart defects limb shortening
• Heart hand syndrome Spanish type
• Heart hypertrophy, hereditary
• Heart situs anomaly
• Heart tumor of the adult
• Heart tumor of the child
• Heavy metal poisoning
• HEC syndrome
• Hecht–Scott syndrome
• Heckenlively syndrome
• Heide syndrome

Hel

• Heliophobia
• HELLP syndrome
• Helmerhorst–Heaton–Crossen syndrome
• Helminthiasis

Hem

• HEM dysplasia

Hema–Hemi

• Hemangioblastoma
• Hemangioendothelioma
• Hemangioma thrombocytopenia syndrome
• Hemangioma, capillary infantile
• Hemangioma
• Hemangiomatosis, familial pulmonary capillary
• Hemangiopericytoma
• Hematocolpos
• Hemeralopia, congenital essential
• Hemeralopia, familial
• Hemi 3 syndrome
• Hemifacial atrophy agenesis of the caudate nucleus
• Hemifacial atrophy progressive
• Hemifacial hyperplasia strabismus
• Hemifacial microsomia
• Hemihypertrophy in context of NF
• Hemihypertrophy intestinal web corneal opacity
• Hemimegalencephaly
• Hemiplegia
• Hemiplegic migraine, familial

Hemo

• Hemochromatosis
  • Hemochromatosis type 1
  • Hemochromatosis type 2
  • Hemochromatosis type 3
  • Hemochromatosis type 4
• Hemoglobin C disease
• Hemoglobin E disease
• Hemoglobin SC disease
• Hemoglobinopathy
• Hemoglobinuria
• Hemolytic anemia lethal genital anomalies
• Hemolytic-uremic syndrome
• Hemophagocytic lymphohistiocytosis
• Hemophagocytic reticulosis
• Hemophilia A
• Hemophilic arthropathy
• Hemophobia
• Hemorrhagic fever with renal syndrome
• Hemorrhoid
• Hemorrhagic proctocolitis
• Hemorrhagic thrombocythemia
• Hemorrhagiparous thrombocytic dystrophy
• Hemosiderosis
• Hemothorax

Hen

• Hennekam–Beemer syndrome
• Hennekam–Koss–de Geest syndrome
• Hennekam syndrome
• Hennekam–Van der Horst syndrome
• Henoch–Schönlein purpura

Hep

• Hepadnovirus D
• Heparane sulfamidase deficiency
• Heparin-induced thrombopenia
• Hepatic cystic hamartoma
• Hepatic ductular hypoplasia
• Hepatic encephalopathy
• Hepatic fibrosis renal cysts mental retardation
• Hepatic fibrosis
• Hepatic venoocclusive disease
• Hepatic veno-occlusive disease
• Hepatitis
• Hepatitis A
• Hepatitis B
• Hepatitis C
• Hepatitis D
• Hepatitis E
• Hepatoblastoma
• Hepatocellular carcinoma
• Hepatorenal syndrome
• Hepatorenal tyrosinemia

Her

• Herpes

Here

Hered

Heredi

Hereditary a – Hereditary m

• Hereditary amyloidosis
• Hereditary angioedema
• Hereditary ataxia
• Hereditary breast–ovarian cancer syndrome
• Hereditary carnitine deficiency myopathy
• Hereditary carnitine deficiency syndrome
• Hereditary carnitine deficiency
• Hereditary ceroid lipofuscinosis
• Hereditary coproporphyria
• Hereditary deafness
• Hereditary elliptocytosis
• Hereditary fibrinogen Aα-Chain amyloidosis
• Hereditary fructose intolerance
• Hereditary hearing disorder
• Hereditary hearing loss
• Hereditary hemochromatosis
• Hereditary hemorrhagic telangiectasia
• Hereditary hyperuricemia
• Hereditary macrothrombocytopenia
• Hereditary methemoglobinemia, recessive
• Hereditary myopathy with intranuclear filamentous

Hereditary n – Hereditary t

• Hereditary nodular heterotopia
• Hereditary non-spherocytic hemolytic anemia
• Hereditary pancreatitis
• Hereditary paroxysmal cerebral ataxia
• Hereditary peripheral nervous disorder
• Hereditary primary Fanconi disease
• Hereditary resistance to anti-vitamin K
• Hereditary sensory and autonomic neuropathy 3
• Hereditary sensory and autonomic neuropathy 4
• Hereditary sensory neuropathy type I
• Hereditary sensory neuropathy type II
• Hereditary spastic paraplegia
• Hereditary spherocytic hemolytic anemia
• Hereditary spherocytosis
• Hereditary type 1 neuropathy
• Hereditary type 2 neuropathy

Herm–Hers

• Hermansky–Pudlak syndrome
• Hermaphroditism
• Hernandez–Aguire–Negrete syndrome
• Herpangina
• Herpes encephalitis
• Herpes simplex disease
• Herpes simplex encephalitis
• Herpes viridae disease
• Herpes virus antenatal infection
• Herpes zoster oticus
• Herpes zoster
• Herpesvirus simiae B virus
• Herpetic embryopathy
• Herpetic keratitis
• Herpetophobia
• Herrmann–Opitz arthrogryposis syndrome
• Herrmann–Opitz craniosynostosis
• Hers' disease
• Hersh–Podruch–Weisskopk syndrome

Het–Hex

• Heterophobia
• Heterotaxia (generic term)
• Heterotaxia autosomal dominant type
• Heterotaxy with polysplenia or asplenia
• Heterotaxy, visceral, X-linked
• Hexosaminidases A and B deficiency

Hh

• HHH syndrome

Hi

Hib–Hip

• Hibernian fever, familial
• Hiccups
• Hidradenitis suppurativa familial
• Hidradenitis suppurativa
• Hidrotic ectodermal dysplasia type Christianson Fouris
• High scapula
• High-molecular-weight kininogen deficiency, congenital
• Hillig syndrome
• Hing–Torack–Dowston syndrome
• Hinson–Pepys disease
• Hip dislocation
• Hip dysplasia Beukes type
• Hip dysplasia (canine)
• Hip dysplasia (human)
• Hip luxation
• Hip subluxation
• Hipo syndrome

Hir–Hiv

• Hirschsprung disease
  • Hirschsprung disease ganglioneuroblastoma
  • Hirschsprung disease polydactyly heart disease
  • Hirschsprung disease type 2
  • Hirschsprung disease type 3
  • Hirschsprung disease type d brachydactyly
  • Hirschsprung microcephaly cleft palate
  • Hirschsprung nail hypoplasia dysmorphism
• Hirsutism congenital gingival hyperplasia
• Hirsutism skeletal dysplasia mental retardation
• His bundle tachycardia
• Histadelia
• Histapenia
• Histidinemia
• Histidinuria renal tubular defect syndrome
• Histiocytosis X
• Histiocytosis, Non-Langerhans-Cell
• Histoplasmosis
• Histrionic personality disorder
• Hittner–Hirsch–Kreh syndrome
• HIV

Hm

• Hm syndrome
• HMG-CoA lyase deficiency
• HMG CoA synthetase deficiency

Ho

Hod–Hol

• Hodgkin lymphoma
• Hodgkin's disease
• Hoepffner–Dreyer–Reimers syndrome
• Hollow visceral myopathy
• Holmes–Benacerraf syndrome
• Holmes–Borden syndrome
• Holmes–Collins syndrome
• Holmes–Gang syndrome
• Holoacardius amorphus
• Holocarboxylase synthetase deficiency
• Holoprosencephaly caudal dysgenesis
• Holoprosencephaly deletion 2p
• Holoprosencephaly ectrodactyly cleft lip palate
• Holoprosencephaly radial heart renal anomalies
• Holoprosencephaly
• Holt–Oram syndrome
• Holzgreve–Wagner–Rehder syndrome

Hom–Hoy

• Homocarnosinase deficiency
• Homocarnosinosis
• Homocystinuria due to cystathionine beta-synthase
• Homocystinuria due to defect in methylation (cbl g)
• Homocystinuria due to defect in methylation cbl e
• Homocystinuria due to defect in methylation, MTHFR deficiency
• Homocystinuria
• Homologous wasting disease
• Homozygous hypobetalipoproteinemia
• Hoon–Hall syndrome
• Hordnes–Engebretsen–Knudtson syndrome
• Horn–Kolb syndrome
• Horner's syndrome
• Hornova–Dlurosova syndrome
• Horseshoe kidney
• Horton disease, juvenile
• Horton disease
• Hot tub folliculitis
• Houlston–Ironton–Temple syndrome
• Howard–Young syndrome
• Howel–Evans syndrome
• Hoyeraal–Hreidarsson syndrome
• Hoyeraal syndrome

Hs

• HSV-2 infection

Hu

• Human ewingii ehrlichiosis
• Human granulocytic ehrlichiosis
• Human monocytic ehrlichiosis
• Human parvovirus B19 infection
• Humero spinal dysostosis congenital heart disease
• Humeroradial synostosis
• Humeroradioulnar synostosis
• Humerus trochlea aplasia of
• Hunter–Carpenter–Mcdonald syndrome
• Hunter–Jurenka–Thompson syndrome
• Hunter–Macpherson syndrome
• Hunter–Mcalpine syndrome
• Hunter–Mcdonald syndrome
• Hunter–Rudd–Hoffmann syndrome
• Hunter syndrome
• Huntington's disease
• Huriez scleroatrophic syndrome
• Hurler syndrome
• Hurst–Hallam–Hockey syndrome
• Hutchinson–Gilford–Progeria syndrome
• Hutchinson incisors
• Hutteroth–Spranger syndrome

Hy

Hya

• Hyalinosis systemic short stature
• Hyaloideoretinal degeneration of wagner

Hyd

Hyda–Hyde

• Hydantoin antenatal infection
• Hydatidiform mole
• Hydatidosis
• Hyde–Forster–Mccarthy–Berry syndrome

Hydr

• Hydranencephaly
• Hydrocephalus - Arnold Chiari - allied disorders
• Hydrocephalus autosomal recessive
• Hydrocephalus costovertebral dysplasia Sprengel anomaly
• Hydrocephalus craniosynostosis bifid nose
• Hydrocephalus endocardial fibroelastosis cataract
• Hydrocephalus growth retardation skeletal anomalies
• Hydrocephalus obesity hypogonadism
• Hydrocephalus skeletal anomalies
• Hydrocephalus
• Hydrocephaly corpus callosum agenesis diaphragmatic hernia
• Hydrocephaly low insertion umbilicus
• Hydrocephaly tall stature joint laxity
• Hydrolethalus syndrome
• Hydronephrosis
• Hydronephrosis peculiar facial expression
• Hydrophobia
• Hydrops ectrodactyly syndactyly
• Hydrops fetalis anemia immune disorder absent thumb
• Hydrops fetalis
• Hydroxycarboxylic aciduria
• Hydroxymethylglutaric aciduria

Hyg-Hym

• Hygroma cervical
• Hymenolepiasis

Hyp

Hyper

• Hyper IgE
• Hyper IgM syndrome

Hypera–Hyperb

• Hyperadrenalism
• Hyperaldosteronism familial type 2
• Hyperaldosteronism, familial type 1
• Hyperaldosteronism
• Hyperammonemia
• Hyperandrogenism
• Hyperbilirubinemia transient familial neonatal
• Hyperbilirubinemia type 1
• Hyperbilirubinemia type 2
• Hyperbilirubinemia

Hyperc–Hyperg

• Hypercalcemia, familial benign type 1
• Hypercalcemia, familial benign type 2
• Hypercalcemia, familial benign type 3
• Hypercalcemia, familial benign
• Hypercalcemia
• Hypercalcinuria idiopathic
• Hypercalcinuria macular coloboma
• Hypercalcinuria
• Hypercementosis
• Hypercholesterolemia due to arg3500 mutation of Apo B-100
• Hypercholesterolemia due to LDL receptor deficiency
• Hypercholesterolemia
• Hyperchylomicronemia
• Hyperekplexia
• Hypereosinophilic syndrome
• Hyperferritinemia, hereditary, with congenital cataracts
• Hypergeusia
• Hyperglycemia
• Hyperglycerolemia
• Hyperglycinemia, isolated nonketotic type 1
• Hyperglycinemia, isolated nonketotic type 2
• Hyperglycinemia, isolated nonketotic
• Hyperglycinemia, ketotic
• Hyperglycinemia, non-ketotic
• Hypergonadotropic ovarian failure, familial or sporadic

Hyperh–Hyperk

• Hyperhidrosis
• Hyperhomocysteinemia
• Hyper-IgD syndrome
• Hyperimidodipeptiduria
• Hyperimmunoglobinemia D with recurrent fever
• Hyperimmunoglobulin E - recurrent infection syndrome
• Hyperimmunoglobulinemia D with periodic fever
• Hyperimmunoglobulinemia E
• Hyperinsulinism due to focal adenomatous hyperplasia
• Hyperinsulinism due to glucokinase deficiency
• Hyperinsulinism due to glutamodehydrogenase deficiency
• Hyperinsulinism in children, congenital
• Hyperinsulinism, diffuse
• Hyperinsulinism, focal
• Hyperkalemia
• Hyperkalemic periodic paralysis
• Hyperkeratosis lenticularis perstans of Flegel
• Hyperkeratosis lenticularis perstans
• Hyperkeratosis palmoplantar localized acanthokeratolytic
• Hyperkeratosis palmoplantar localized epidermolytic
• Hyperkeratosis palmoplantar with palmar crease hyperkeratosis

Hyperl–Hypero

• Hyperlipoproteinemia type I
• Hyperlipoproteinemia type II
• Hyperlipoproteinemia type III
• Hyperlipoproteinemia type IV
• Hyperlipoproteinemia type V
• Hyperlipoproteinemia
• Hyperlysinemia
• Hyperopia
• Hyperornithinemia
• Hyperornithinemia, hyperammonemia, homocitrullinuria syndrome
• Hyperostosid corticalis deformans juvenilis
• Hyperostosis cortical infantile
• Hyperostosis corticalis generalisata
• Hyperostosis frontalis interna
• Hyperoxaluria type 1
• Hyperoxaluria type 2
• Hyperoxaluria

Hyperp–Hypers

• Hyperparathyroidism
• Hyperparathyroidism, familial, primary
• Hyperparathyroidism, neonatal severe primary
• Hyperphalangism dysmorphy bronchomalacia
• Hyperphenylalaninemia
• Hyperphenylalaninemia due to pterin-4-alpha-carbin
• Hyperphenylalaninemia due to dihydropteridine reductase deficiency
• Hyperphenylalaninemia due to 6-pyruvoyltetrahydrop
• Hyperphenylalaninemia due to dehydratase deficiency
• Hyperphenylalaninemia due to GTP cyclohydrolase deficiency
• Hyperphenylalaninemic embryopathy
• Hyperpipecolatemia
• Hyperprolactinemia
• Hyperprolinemia type II
• Hyperprolinemia
• Hyperreflexia
• Hyper-reninism
• Hypersensitivity

• Hypersensitivity type I
• Hypersensitivity type II
• Hypersensitivity type III
• Hypersensitivity type IV

• Hypersomnolence

Hypert–Hyperv

• Hypertelorism and tetralogy of Fallot
• Hypertelorism hypospadias syndrome
• Hypertension
• Hypertensive hyperkalemia, familial
• Hypertensive hypokalemia familial
• Hypertensive retinopathy
• Hyperthermia induced defects
• Hyperthermia
• Hyperthyroidism
• Hyperthyroidism due to mutations in TSH receptor
• Hypertrichosis atrophic skin ectropion macrostomia
• Hypertrichosis brachydactyly obesity and mental retardation
• Hypertrichosis congenital generalized X linked
• Hypertrichosis lanuginosa congenita
• Hypertrichosis lanuginosa, acquired
• Hypertrichosis retinopathy dysmorphism
• Hypertrichosis, anterior cervical
• Hypertrichotic osteochondrodysplasia
• Hypertriglycidemia
• Hypertrophic branchial myopathy
• Hypertrophic cardiomyopathy
• Hypertrophic hemangiectasia
• Hypertrophic myocardiopathy
• Hypertrophic osteoarthropathy, primary or idiopathic
• Hypertropia
• Hypertropic neuropathy of Dejerine-Sottas
• Hypertryptophanemia
• Hypervitaminosis A
• Hypervitaminosis D
• Hypervitaminosis E

Hypo

Hypoa–Hypof

• Hypoactive sexual desire disorder
• Hypoadrenalism
• Hypoadrenocorticism hypoparathyroidism moniliasis
• Hypoaldosteronism
• Hypo-alphalipoproteinemia primary
• Hypobetalipoproteinaemia ataxia hearing loss
• Hypobetalipoprotéinemia, familial
• Hypocalcemia, autosomal dominant
• Hypocalcemia
• Hypocalciuric hypercalcemia, familial
• Hypochondriasis
• Hypochondrogenesis
• Hypochondroplasia
• Hypocomplementemic urticarial vasculitis
• Hypodermyasis
• Hypodontia dysplasia of nails
• Hypodontia of incisors and premolars
• Hypodysfibrinogenemia
• Hypofibrinogenemia, familial

Hypog–Hypol

• Hypoglycemia with deficiency of glycogen synthetase in the liver
• Hypoglycemia
• Hypogonadism cardiomyopathy
• Hypogonadism hypogonadotropic due to mutations in GR hormone
• Hypogonadism male mental retardation skeletal anomaly
• Hypogonadism mitral valve prolapse mental retardation
• Hypogonadism primary partial alopecia
• Hypogonadism retinitis pigmentosa
• Hypogonadism, isolated, hypogonadotropic
• Hypogonadism
• Hypogonadotropic hypogonadism syndactyly
• Hypogonadotropic hypogonadism without anosmia, X linked
• Hypogonadotropic hypogonadism-anosmia, X linked
• Hypogonadotropic hypogonadism-anosmia
• Hypohidrotic Ectodermal Dysplasia
• Hypokalemia
• Hypokalemic alkalosis with hypercalcinuria
• Hypokalemic periodic paralysis
• Hypokalemic periodic paralysis type 1
• Hypokalemic sensory overstimulation
• Hypoketonemic hypoglycemia
• Hypolipoproteinemia

Hypom

• Hypomagnesemia primary
• Hypomandibular faciocranial dysostosis
• Hypomelanotic disorder
• Hypomelia Müllerian duct anomalies
• Hypomentia

Hypop

• Hypoparathyroidism familial isolated
• Hypoparathyroidism nerve deafness nephrosis
• Hypoparathyroidism short stature mental retardation
• Hypoparathyroidism short stature
• Hypoparathyroidism X linked
• Hypoparathyroidism
• Hypophosphatasia, infantile
• Hypophosphatasia
• Hypophosphatemic rickets
• Hypopigmentation oculocerebral syndrome Cross type
• Hypopituitarism micropenis cleft lip palate
• Hypopituitarism postaxial polydactyly
• Hypopituitarism
• Hypopituitary dwarfism
• Hypoplasia hepatic ductular
• Hypoplasia of the tibia with polydactyly
• Hypoplastic left heart syndrome
• Hypoplastic right heart microcephaly
• Hypoplastic thumb Müllerian aplasia
• Hypoplastic thumbs hydranencephaly
• Hypoproconvertinemia
• Hypoprothrombinemia

Hypor–Hypox

• Hyporeninemic hypoaldosteronism
• Hyposmia nasal hypoplasia hypogonadism
• Hypospadias familial
• Hypospadias mental retardation Goldblatt type
• Hyposplenism
• Hypotelorism cleft palate hypospadias
• Hypothalamic dysfunction
• Hypothalamic hamartoblastoma syndrome
• Hypothalamic hamartomas
• Hypertonic gingivitus
• Hypothermia
• Hypothyroidism due to iodide transport defect
• Hypothyroidism postaxial polydactyly mental retardation
• Hypothyroidism
• Hypotonic sclerotic muscular dystrophy
• Hypotrichosis mental retardation Lopes type
• Hypotrichosis
• Hypotropia
• Hypoxanthine guanine phosphoribosyltransferase deficiency
• Hypoxia