- Macrocephaly
- Magnetic Resonance Imaging
- Malnutrition
- Malocclusion
- Marfan Syndrome
- Massage Therapy
- Mastoiditis
- Masturbation
- Maxillofacial Trauma
- Measles
- Meningitis
- Meningococcal Meningitis Vaccine
- Meningococcemia
- Menstruation
- Mental Retardation
- Methylphenidate
- Mineral Deficiency
- Mineral Toxicity
- Minerals
- Minnesota Multiphasic Personality Inventory
- Minority Health
- Mitochondrial Disorders
- MMR Vaccine
- Moles
- Mood Disorders
- Moral Development
- Motion Sickness
- Movement Disorders
- Mucopolysaccharidoses
- Multicultural Education/Curriculum
