| Watery eyes | http://bio2rdf.org/meddra:C3257803 | | |
| Wave slowing | http://bio2rdf.org/meddra:C0858603 | | |
| Weepiness | http://bio2rdf.org/meddra:C0424109 | | |
| Wegener Granulomatosis | http://bio2rdf.org/meddra:C0043092 | | |
| Weight Gain | http://bio2rdf.org/meddra:C0043094 | | |
| Welts | http://bio2rdf.org/meddra:C0221232 | | |
| Wernicke Encephalopathy | http://bio2rdf.org/meddra:C0043121 | | |
| Wheezing | http://bio2rdf.org/meddra:C0043144 | | |
| White blood cell count decreased | http://bio2rdf.org/meddra:C0750394 | | |
| Withdrawal Symptoms | http://bio2rdf.org/meddra:C0087169 | | |
| Wolff-Parkinson-White Syndrome | http://bio2rdf.org/meddra:C0043202 | | |
| Worried | http://bio2rdf.org/meddra:C0233481 | | |
| Wound Infection | http://bio2rdf.org/meddra:C0043241 | | |
| Wounds and Injuries | http://bio2rdf.org/meddra:C0043251 | | |
| Wound sepsis | http://bio2rdf.org/meddra:C1141927 | | |
| Xanthoma | http://bio2rdf.org/meddra:C0302314 | | |
| Xeroderma Pigmentosum | http://bio2rdf.org/meddra:C0043346 | | |
| Xerosis | http://bio2rdf.org/meddra:C0259817 | | |
| Xerostomia | http://bio2rdf.org/meddra:C0043352 | | |
| X-linked agammaglobulinemia | http://bio2rdf.org/meddra:C0221026 | | |
| Yaws | http://bio2rdf.org/meddra:C0043388 | | |
| Yeast infection | http://bio2rdf.org/meddra:C0750466 | | |
| Yellow complexion | http://bio2rdf.org/meddra:C0558148 | | |
| Zinc deficiency | http://bio2rdf.org/meddra:C0235950 | | |
| Zollinger-Ellison syndrome | http://bio2rdf.org/meddra:C0043515 | | |
| Zygomycosis | http://bio2rdf.org/meddra:C0043541 | | |