1. Ulcer, aphthous (See: Canker sore)
  2. Ulcer, peptic (See: Peptic ulcer)
  3. Ulcer, rectal (See: Solitary rectal ulcer syndrome)
  4. Ulcerative colitis
  5. Ulnar wrist pain
  6. Umbilical hernia
  7. Uncontrollable laughter and crying (See: Pseudobulbar affect)
  8. Underactive thyroid (See: Hypothyroidism)
  9. Under-eye puffiness (See: Bags under eyes)
  10. Undescended testicle
  11. Undifferentiated pleomorphic sarcoma
  12. Unstable angina (See: Angina)
  13. Upset stomach (See: Indigestion)
  14. Ureteral cancer
  15. Ureteral obstruction
  16. Urethral stricture
  17. Urinary incontinence
  18. Urinary tract infection (See: Urinary tract infection (UTI))
  19. Urinary tract infection (UTI)
  20. Urine color
  21. Urine, blood in (See: Blood in urine (hematuria))
  22. Urticaria (See: Hives and angioedema)
  23. Urticaria (See: Chronic hives)
  24. Uterine cancer (See: Endometrial cancer)
  25. Uterine fibroids
  26. Uterine leiomyoma (See: Uterine fibroids)
  27. Uterine myoma (See: Uterine fibroids)
  28. Uterine polyps
  29. Uterine prolapse
  30. Uterus didelphys (See: Double uterus)
  31. Uveal melanoma (See: Eye melanoma)
  32. Uveitis
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