Prime
- Waldenstrom's macroglobulinemia
- Warfarin overdose
- Warts
- Warts, anorectal
- Warts, genital
- Weakness
- Weakness, proximal muscle
- Weakness & paralysis
- Weeping or encrusted lesions
- Weepy (weeping) lesions
- Wegener's granulomatosis
- Wegener's granulomatosis and autoantibodies
- Weight gain
- Wellbutrin
- Wellbutrin SR
- Wermer's syndrome
- Wernicke's encephalopathy
- West Nile virus
- Wheezing
- Whipple's disease
- Whipworm infection
- Whooping cough
- Wilson's disease
- Wrist drop
- Wrist pain
- Wuchereria bancrofti, filariasis from
- Wytensin