China 
Africa 
- Wechsler Memory Scale
- Wechsler Preschool and Primary Scale of Intelligence
- Wedge resection
- Wee1
- Weekend effect
- Weibel-Palade body
- Weibull distribution
- Weight cutting
- Weight cycling
- Weight gain
- Weight loss
- Weight management
- Weight-bearing
- Weighted mean
- Weightlessness
- Weil-Felix test
- Weill-Marchesani syndrome
- Weissella
- Well-woman examination
- Wellens' syndrome
- Wellness
- Wellness Recovery Action Plan
- Wells score
- Werdnig-Hoffmann disease
- Werner syndrome
- Wernicke area
- Wernicke encephalopathy
- Wernicke's area
- Wernicke's encephalopathy
- Wernicke-Korsakoff Syndrome
- West Nile fever
- West Nile virus
- West syndrome
- Westermark sign
- Western Aphasia Battery
- Western blot
- Western blotting
- Western diet
- Wet chemistry
- Wet dreams
- Wet macular degeneration
- Wet nurse
- Wet oxidation
- Wetware
- Wharton's jelly
- Wheat allergy
- Wheat germ agglutinin
- Wheat germ oil
- Wheat gluten
- Wheat starch
- Wheatgrass
- Wheatstone bridge
- Wheelchair
- Wheelchair cushion
- Wheelchair ramps
- Wheezing
- Whey
- Whey acidic protein
- Whey powder
- Whey protein concentrate
- Whey protein isolate
- Whiplash
- Whiplash injury
- Whipple's disease
- Whipple's triad
- Whirlpool sign
- Whispered pectoriloquy
- Whispering
- White
- White blood cell differential
- White blood cells
- White cane
- White cerebellum sign
- White coat hypertension
- White dot syndromes
- White matter
- White matter lesions
- White noise machine
- White petrolatum
- White piedra
- White pulp
- White ramus communicans
- White roll
- White superficial onychomycosis
- Whitfield's ointment
- Whitlockite
- Whitlow
- Whitten effect
- Whole Language
- Whole blood
- Whole blood clotting test
- Whole body imaging
- Whole body scanner
- Whole body vibration
- Whole bowel irrigation
- Whole brain radiotherapy
- Whole genome sequencing
- Whole lung lavage
- Whole-cell vaccines
- Whole30
- Whooping cough
- Wicked problems
- Wickerhamomyces anomalus
- Wickham striae
- Widal test
- Wide local excision
- Wide-angle X-ray scattering
- Widened mediastinum
- Wiener index
- Wikstroemia
- Wikstroemia indica
- Wilbrand's knee
- Wilcoxon signed rank test
- Wilcoxon signed ranks test
- Wild lettuce
- Wild type
- Wild-type transthyretin amyloid
- Wilderness medicine
- Wilderness therapy
- Wildfires
- Wilhelmy plate
- Wilks' theorem
- Williams Beuren Syndrome
- Williams syndrome
- Wilms tumour
- Wilms' tumor
- Wilson's disease
- Windkessel effect
- Window of opportunity
- Window period
- Wing
- Wingate test
- Winged
- Winged helix
- Winged scapula
- Wintergreen
- Wisconsin Card Sorting Test
- Wisdom of the Crowd
- Wisdom teeth
- Wiskott-Aldrich Syndrome
- Witch hazel
- Withaferin A
- Withanolide
- Withdrawal
- Withdrawal bleeding
- Withdrawal reflex
- Wittmann Patch
- Wnt
- Wnt protein
- Wnt signaling pathway