| Unrest | http://bio2rdf.org/meddra:C0858854 | | |
| Unspecified visual loss | http://bio2rdf.org/meddra:C3665346 | | |
| Upper Respiratory Infections | http://bio2rdf.org/meddra:C0041912 | | |
| Upset stomach | http://bio2rdf.org/meddra:C0235309 | | |
| Urate nephropathy | http://bio2rdf.org/meddra:C2955673 | | |
| Urea Cycle Disorders, Inborn | http://bio2rdf.org/meddra:C0154246 | | |
| Uremia | http://bio2rdf.org/meddra:C0041948 | | |
| Urethritis | http://bio2rdf.org/meddra:C0041976 | | |
| Urge Incontinence | http://bio2rdf.org/meddra:C0150045 | | |
| Urgency of micturition | http://bio2rdf.org/meddra:C0085606 | | |
| Uric acid level increased | http://bio2rdf.org/meddra:C0041981 | | |
| Urinary Incontinence | http://bio2rdf.org/meddra:C0042024 | | |
| Urinary Retention | http://bio2rdf.org/meddra:C0080274 | | |
| Urinary Stress Incontinence | http://bio2rdf.org/meddra:C0042025 | | |
| Urinary tract infection | http://bio2rdf.org/meddra:C0042029 | | |
| Urinary tract obstruction | http://bio2rdf.org/meddra:C0178879 | | |
| Urine volume finding | http://bio2rdf.org/meddra:C1287298 | | |
| Urogenital disorder | http://bio2rdf.org/meddra:C0080276 | | |
| Urogenital trichomoniasis | http://bio2rdf.org/meddra:C0040928 | | |
| Urolithiasis | http://bio2rdf.org/meddra:C0451641 | | |
| Urologic Diseases | http://bio2rdf.org/meddra:C0042075 | | |
| Urticaria | http://bio2rdf.org/meddra:C0042109 | | |
| Urticaria chronic | http://bio2rdf.org/meddra:C0263338 | | |
| Urticaria physical | http://bio2rdf.org/meddra:C0343065 | | |
| Uterine Cancer | http://bio2rdf.org/meddra:C0153567 | | |
| Uterine Cervicitis | http://bio2rdf.org/meddra:C0007860 | | |
| Uterine Contraction | http://bio2rdf.org/meddra:C0042130 | | |
| Uterine cramps | http://bio2rdf.org/meddra:C0948782 | | |
| Uterine Fibroids | http://bio2rdf.org/meddra:C0042133 | | |
| Uterine hemorrhage | http://bio2rdf.org/meddra:C0042134 | | |