- Haemangioma
- Haematemesis (vomiting blood)
- Haematuria
- Haemochromatosis
- Haemophilia
- Haemophilus influenzae type b
- Haemorrhage, brain
- Haemorrhoids (piles)
- Hair loss (alopecia)
- Hairy body or face
- Hairy cell leukaemia
- Halitosis (bad breath)
- Hallux valgus
- Hand, foot and mouth disease
- Hand tendon, repair
- Hangover
- Hay fever
- Head and neck cancer
- Head injury, minor
- Head injury, severe
- Head lice
- Headache, cluster
- Headache, tension-type
- Headaches
- Hearing aids
- Hearing and vision tests for children
- Hearing impairment
- Hearing tests
- Heart attack
- Heart block
- Heart bypass
- Heart disease, congenital
- Heart disease, coronary
- Heart failure
- Heart lung transplant
- Heart palpitations
- Heart transplant
- Heartburn
- Heartburn in pregnancy
- Heat exhaustion and heatstroke
- Heat rash
- Heel pain
- Hepatitis
- Hepatitis A
- Hepatitis B
- Hepatitis B vaccination
- Hepatitis C
- Herceptin
- Hereditary motor and sensory neuropathy
- Hernia
- Hernia, femoral
- Hernia, hiatus
- Hernia, inguinal
- Herpes, genital
- Herpes simplex eye infections
- Herpes simplex virus
- Herpes zoster virus
- Hib/Men C vaccine
- Hiccup
- Hidradenitis suppurativa
- High blood pressure
- High cholesterol
- Hip fracture
- Hip pain in children
- Hip replacement
- Hirsutism
- HIV and AIDS
- Hives
- Hoarding
- Hodgkin's lymphoma
- Hole in the heart
- Hormone replacement therapy (HRT)
- Housemaid's knee
- HPV vaccination
- Hughes syndrome
- Hunchback
- Huntington's disease
- Hydatidiform mole
- Hydrocephalus
- Hydronephrosis
- Hydrophobia
- Hymenolepis
- Hypercholesterolaemia
- Hyperglycaemia
- Hyperhidrosis (excessive sweating)
- Hyperlipidemia
- Hypermetropia
- Hypermobility
- Hyperopia
- Hypertension
- Hyperthyroidism
- Hypnotherapy
- Hypoglycaemia
- Hypotension
- Hypothermia
- Hypothyroidism
- Hypotonia
- Hysterectomy
- Hysteroscopy