Africa 
China 
Japan 
MENA 
- Mediastinoscopy
- Mediator
- Medic
- Medicago sativa
- Medicago truncatula
- Medical Device Reporting
- Medical Orders for Life-Sustaining Treatment
- Medical Priority Dispatch System
- Medical Subject Headings
- Medical abortion
- Medical algorithms
- Medical anthropology
- Medical assessment
- Medical bag
- Medical case management
- Medical classification
- Medical consensus
- Medical debt
- Medical decision making
- Medical direction
- Medical director
- Medical education
- Medical electronics
- Medical emergency
- Medical errors
- Medical ethics
- Medical examiner
- Medical food
- Medical geneticist
- Medical gloves
- Medical grade silicone
- Medical humanities
- Medical image computing
- Medical imaging
- Medical implants
- Medical license
- Medical model of disability
- Medical neglect
- Medical physics
- Medical procedure
- Medical record
- Medical simulation
- Medical social work
- Medical sociology
- Medical software
- Medical statistics
- Medical technology
- Medical terminology
- Medical tests
- Medical tourism
- Medical toxicology
- Medical ultrasonography
- Medicalization
- Medically unexplained symptoms
- Medicare Part D
- Medicarpin
- Medication compliance
- Medication costs
- Medication discontinuation
- Medication errors
- Medication overuse headache
- Medication-related osteonecrosis of the jaw
- Medicinal chemistry
- Medicinal mushrooms
- Medicinal plants
- Medicinal properties
- Medicine
- Medicines reconciliation
- Mediterranean diet
- Medium chain fatty acids
- Medium chain triglycerides
- Medium spiny neurons
- Medoid
- Medrogestone
- Medroxyprogesterone
- Medroxyprogesterone acetate
- Medulla
- Medulla oblongata
- Medullary cavity
- Medullary cystic disease
- Medullary cystic kidney disease
- Medullary pyramid
- Medullary pyramids
- Medullary rays
- Medullary sponge kidney
- Medullary thymic epithelial cells
- Medullary thyroid cancer
- Medulloblastoma
- Medulloepithelioma
- Mef2
- Mefenamic acid
- Mefloquine
- Megacolon
- Megacystis
- Megaesophagus
- Megakaryoblast
- Megakaryocytes
- Megalencephaly
- Megaloblast
- Megaloblastic anemia
- Megalocornea
- Megalomania
- Megamitochondria
- Megamonas
- Meganucleases
- Megarectum
- Megasphaera
- Megavitamin therapy
- Megavoltage X-rays
- Megavoltage x-rays
- Megestrol
- Megestrol acetate
- Meglitinide
- Meglumine
- Meglumine antimoniate
- Meibomian gland
- Meibomian gland dysfunction
- Meige's syndrome
- Meigs syndrome
- Meigs' syndrome
- Meiosis
- Meiotic recombination
- Meiotic spindle
- Meissner's corpuscles
- Meissner's plexus
- Mel scale
- Melamine
- Melamine resin
- Melan A
- Melancholia
- Melancholic depression
- Melanin
- Melanin concentrating hormone
- Melanin-concentrating hormone
- Melanism
- Melanization
- Melanocortin
- Melanocortin 1 receptor
- Melanocortin 3 receptor
- Melanocortin 4 receptor
- Melanocortin receptors
- Melanocyte stimulating hormone
- Melanocytes
- Melanocytic nevi
- Melanocytic tumors
- Melanocytic tumors of uncertain malignant potential
- Melanogenesis
- Melanoma
- Melanoma-associated antigen
- Melanonychia