• Ulcerative colitis

• Ultrasound scan

• Umbilical hernia repair

• Underactive thyroid (hypothyroidism)

• Undescended testicles

• Unintentional weight loss

• Urethritis

• Urinary catheter

• Urinary incontinence

• Urinary tract infections (UTIs)

• Urine albumin to creatinine ratio (ACR)

• Uveitis