- Ulcer, Leg see Leg Injuries and Disorders
- Ulcerative Colitis
- Ulcers see Peptic Ulcer
- Ultraviolet Rays see Sun Exposure
- Umbilical Hernia see Hernia
- Uncommon Infant and Newborn Problems
- Underactive Thyroid see Hypothyroidism
- Underage Drinking
- Understanding Medical Research
- Underweight see Body Weight
- Undescended Testicle see Testicular Disorders
- Universal Precautions see Infection Control
- Upset Stomach see Indigestion
- Ureteral Cancer see Ureteral Disorders
- Ureteral Disorders
- Urethral Cancer see Urethral Disorders
- Urethral Disorders
- Urinalysis
- Urinary Bladder Cancer see Bladder Cancer
- Urinary Incontinence
- Urinary Tract Infections
- Urination see Urine and Urination
- Urine and Urination
- Urine Tests see Urinalysis
- Urostomy see Ostomy
- Urticaria see Hives
- Usher Syndrome
- Uterine bleeding see Vaginal Bleeding
- Uterine Cancer
- Uterine Cervix Disorders see Cervix Disorders
- Uterine Diseases
- Uterine Fibroids
- Uterine Leiomyomata see Uterine Fibroids
- Uterine Prolapse see Pelvic Floor Disorders
- UTI see Urinary Tract Infections
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