Diagnosaurus
- Waldenstrom's macroglobulinemia
- Warts, genital
- Warts, nongenital
- Weakness
- Weakness, proximal muscle
- Weeping or encrusted lesions
- Wegener's granulomatosis
- Weight gain
- Weight gain and fatigue
- Weight loss, involuntary
- Weight loss and back pain
- Weight loss and fatigue
- Weight loss and fever
- Weight loss and peripheral neuropathy
- Wernicke's encephalopathy
- Wheezing
- Whipple's disease
- Whipworm
- Whooping cough
- Wide pulse pressure
- Wilson's disease
- Withdrawal, alcohol
- Withdrawal, opioid
- Wrist drop (radial nerve palsy)
- Wrist pain