- Waldenstrom’s Macroglobulinemia
- Whipple’s Disease
- Wilson’s Disease
- Wallenberg’s Syndrome
- Whipworm Infections
- Williams Syndrome
- Warts
- White Dot Syndrome
- Wolf-Hirschhorn Syndrome
- Wegener’s Granulomatosis
- Whooping Cough
- Wolff-Parkinson-White Syndrome
- Wernicke’s Encephalopathy
- von Willebrand’s Disease
- Wounds, Penetrating and Non-penetrating