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.

HAE see C1 Esterase Inhibitor Deficiency
HCH see Hypochondroplasia
HCM see Cardiomyopathies
HGG see Primary Immunodeficiencies
HGPRT Deficiency see Lesch Nyhan syndrome
HH see Hypothalmic Hamartoma
HHH see Metabolic diseases
HHT see Hereditary Haemorrhagic Telangiectasia
HIV Infection and AIDS
HLH see Histiocytosis
HLHS see Hypoplastic Left Heart syndrome
HME see Hemimegalencephaly
HMG CoA Lyase Deficiency see Organic Acidaemias
HMS see Hypermobility
HOCM see Cardiomyopathies
HOOD see Nail-Patella syndrome
HPE see Holoprosencephaly
HPRT see Lesch Nyhan syndrome
HSAN see Congenital Insensitivity/Indifference to Pain
HSAN Type I see Congenital Insensitivity/Indifference to Pain
HSAN Type II see Congenital Insensitivity/Indifference to Pain
HSAN Type III see Congenital Insensitivity/Indifference to Pain
HSAN Type IV see Congenital Insensitivity/Indifference to Pain
HSP see Henoch Schonlein Purpura
Haemangiomas see Vascular Birthmarks
Haemochromatosis
Haemolytic Uraemic syndrome
Haemophagocytic Lymphohistiocytosis see Histiocytosis
Haemophilia, von Willebrand disease and other coagulation defects
Haemorrhagic nodular glycolipid lipidosis see Fabry disease
Hallervorden-Spatz syndrome see Neuroacanthocytosis disorders
Hand Schuller Christian syndrome see Histiocytosis
Harlequin Ichthyosis see Ichthyosis
Hartnup disease see Metabolic diseases
Hashimoto's disease see Thyroid Disorders
Hashimoto's Encephalitis
Head Injuries see Brain Injuries
Heart and Heart/Lung Transplant
Heart Defects
Hemifacial Microsomia see Goldenhar syndrome
Hemimegalencephaly
Hemimelia
Hemiplegia
Henoch Schonlein Purpura
Hepatitis A see Liver disease
Hepatitis B see Liver disease
Hepatitis C see Liver disease
Hepatoblastoma see Liver disease
Hereditary and Sensory Autonomic Neuropathy see Congenital Insensitivity/Indifference to Pain
Hereditary Angioedema see C1 Esterase Inhibitor Deficiency
Hereditary Coproporphyria see Porphyria
Hereditary Haemorrhagic Telangiectasia
Hereditary Motor and Sensory Neuropathy see Charcot-Marie-Tooth disease
Hereditary Multiple Exostoses
Hereditary oligophrenic cerebellolental degeneration see Marinesco-Sjögren Syndrome
Hereditary Orotic Aciduria see Purine & Pyrimidine Metabolic diseases
Hereditary-Osteo-Onycho-Dysplasia see Nail-Patella syndrome
Hereditary Progressive Arthro-Ophthalmopathy see Stickler syndrome
Hereditary Renal Hypouricaemia see Purine & Pyrimidine Metabolic diseases
Hereditary Spastic Paraplegia see Familial Spastic Paraplegia
Hereditary Thrombophilia
Hermansky-Pudlak syndrome see Albinism
Herpes Simplex encephalitis see Encephalitis
Herpes Simplex Virus Infection see Herpes Virus Infection
Herpes Virus Infection
Hers disease see Glycogen Storage diseases
Hexosaminidase A deficiency see Metabolic diseases
Hind Brain Malformation see Syringomyelia
Hirschsprung Disease-Microcephaly-Mental Retardation syndrome see Mowat-Wilson syndrome
Hirschsprung disease
Histiocytosis
Histiocytosis X see Histiocytosis
Hodgkin's disease see Lymphoma
Holocarboxylase deficiency see Organic Acidaemias
Holoprosencephaly
Holt-Oram syndrome
Homocystinuria see Metabolic diseases
Homozygous Beta Thalassaemia see Thalassaemia Major (ß Thalassaemia)
Horner syndrome see Erb's Palsy
HSCR cleft palate-mental retardation see Goldberg Shprinzten syndrome
Hughes syndrome
Hunter syndrome see Mucopolysaccharide diseases and associated diseases
Huntington's Chorea see Huntington's disease
Huntington's disease
Hurler Scheie see Mucopolysaccharide diseases and associated diseases
Hurler syndrome see Mucopolysaccharide diseases and associated diseases
Hydranencephaly
Hydrocephalus
Hydrophthalmia see Glaucoma
Hydroxicarboxylic Aciduria see Metabolic diseases
Hyobetalipoproteinaemia see Neuroacanthocytosis disorders
Hyobetalipoproteinemia see Neuroacanthocytosis disorders
Hyperactivity see Attention Deficit Hyperactivity Disorder
Hyperammonaemia see Metabolic diseases
Hyperargininaemia see Urea Cycle Disorders
Hypercalcaemia Hypocalcinuria see Metabolic diseases
Hypercalcinuria see Metabolic diseases
Hypercarotinaemia see Metabolic diseases
Hypercholesterolaemia see Metabolic diseases
Hyperchylomicronaemia see Metabolic diseases
Hyperekplexia
Hyperexplexia see Hyperekplexia
Hyperglycinaemia see Metabolic diseases
Hyper IgE syndrome see Primary Immunodeficiencies
Hyper IgM syndrome see Primary Immunodeficiencies
Hyperinsulinism see Metabolic diseases
Hyperkinetic disorder see Attention Deficit Hyperactivity Disorder
Hyperlipidaemia see Metabolic diseases
Hyperlipoproteinaemia see Metabolic diseases
Hypermobility
Hypermobility Type Ehlers-Danlos syndrome see Ehlers-Danlos syndrome
Hyperornithinaemia see Metabolic diseases
Hyperornithinaemia-Hyperammonaemia-Homocitrullinaemia see Metabolic diseases
Hyperoxaluria (Type 1) see Metabolic diseases
Hyperprolinaemia see Metabolic diseases
Hypertelorism see Craniofacial Conditions
Hypertelorism-hypospadias syndrome see Opitz G/BBB syndrome
Hyperthyroidism see Thyroid Disorders
Hypertriglyceridaemia see Metabolic diseases
Hypertrophic Cardiomyopathy see Cardiomyopathies
Hypertrophic Obstructive Cardiomyopathy see Cardiomyopathies
Hypobetalipoprotinaemia see Metabolic diseases
Hypochondrodysplasia see Hypochondroplasia
Hypochondroplasia
Hypogammaglobulinaemia see Primary Immunodeficiencies
Hypoglycaemia see Metabolic diseases
Hypolipoproteinaemia see Metabolic diseases
Hypomania see Bipolar disorder
Hypomelanosis of Ito
Hypomelanosis (Pigmentary Mosaicism) see Hypomelanosis of Ito
Hypoparathyroidism see Metabolic diseases
Hypophosphatasia see Metabolic diseases
Hypophosphatemic Rickets see X-Linked Hypophosphatemia
Hypoplastic Congenital Anaemia see Diamond Blackfan syndrome
Hypoplastic Left Heart syndrome
Hypoprothrombinaemia see Metabolic diseases
Hypospadias
Hypothalmic Hamartoblastoma syndrome see Pallister Hall syndrome
Hypothalmic Hamartoma
Hypothyroidism see Thyroid Disorders
Hypotonia
Hypoxanthine Guanine Phosphoribosyl Transferase Deficiency see Lesch Nyhan syndrome
Hypoxanthine Phosphoribosyltransferase see Purine & Pyrimidine Metabolic diseases