• Haemochromatosis

• Haemophilia

• Haemophilus influenzae type b (Hib)

• Hair dye reactions

• Hair loss

• Hairy cell leukaemia

• Hallucinations and hearing voices

• Hamstring injury

• Hand pain

• Hand tendon repair

• Hand, foot and mouth disease

• Having an operation (surgery)

• Hay fever

• Head and neck cancer

• Head injury and concussion

• Head injury and concussion

• Head injury and concussion

• Head lice and nits

• Headaches

• Hearing aids and implants

• Hearing loss

• Hearing tests

• Hearing tests for children

• Heart attack

• Heart block

• Heart failure

• Heart palpitations

• Heart transplant

• Heartburn and acid reflux

• Heart-lung transplant

• Heat exhaustion and heatstroke

• Heat rash (prickly heat)

• Heavy periods

• Heel pain

• Help for suicidal thoughts

• Henoch-Schönlein purpura (HSP)

• Hepatitis

• Hepatitis A

• Hepatitis B

• Hepatitis C

• Herbal medicines

• Hereditary haemorrhagic telangiectasia (HHT)

• Hereditary neuropathy with pressure palsies (HNPP)

• Hereditary spastic paraplegia

• Hernia

• Herpes simplex eye infections

• Herpetic whitlow (whitlow finger)

• Hiatus hernia

• Hiccups

• Hidradenitis suppurativa (HS)

• High blood pressure (hypertension)

• High blood sugar (hyperglycaemia)

• High cholesterol

• High temperature (fever) in adults

• High temperature (fever) in children

• Hip pain in adults

• Hip pain in children (irritable hip)

• Hip replacement

• Hirschsprung's disease

• HIV and AIDS

• Hives

• Hodgkin lymphoma

• Home oxygen therapy

• Homeopathy

• Homocystinuria

• Hormone headaches

• Hormone replacement therapy (HRT)

• Human papillomavirus (HPV)

• Huntington's disease

• Hydrocephalus

• Hydronephrosis

• Hyperparathyroidism

• Hypnotherapy

• Hypoparathyroidism

• Hypothermia

• Hysterectomy

• Hysteroscopy