- Macular degeneration
- Macular holes
- Mammogram
- Mantoux skin test
- Maori health
- Māori health
- Mastitis
- Measles
- Measles FAQ
- Medicines – tips to remember to take them
- Meibomian cyst
- Melanoma
- Meniere's disease
- Meningitis
- Meningococcal disease
- Meningococcal disease, meningitis & septicaemia
- Menopause
- Menorrhagia
- Menstruation
- Mental distress – supporting a parent
- Mental health conditions
- Mercury and health
- Mesothelioma
- Metabolic syndrome
- Methamphetamine addiction
- Migraine (severe headache)
- Migraine topics
- Milk and dairy allergy or intolerance
- Miscarriage
- Molluscum contagiosum (viral skin infection)
- Monkeypox
- Morning sickness
- Motion sickness
- Motor neurone disease
- Mouth ulcers
- MRI scan
- MRSA – methicillin-resistant Staphylococcus aureus
- Multiple sclerosis
- Mumps
- Muscular dystrophy
- Myalgic encephalopathy
- Myocarditis