Ulcerative keratitis is a serious inflammatory eye condition that causes painful sores and tissue breakdown in the cornea, requiring immediate medical attention to prevent vision loss and, in some cases, life-threatening complications.

Being underweight means your body weight falls below the healthy range needed for your body to function properly. This can lead to various health problems, from weakened bones to fertility issues, and may require medical attention to address underlying causes and restore healthy weight.

Undifferentiated sarcoma is a rare type of cancer that develops in the body’s connective tissues, often affecting the arms, legs, or abdomen. This aggressive disease requires prompt diagnosis and a combination of treatments to give patients the best chance of recovery.

Univentricular heart is a group of serious heart conditions present at birth where only one of the heart’s two pumping chambers can work properly to support the body’s blood circulation.

An upper limb fracture occurs when one of the bones in your arm breaks, from your shoulder down to your hand and fingers. These breaks can range from small cracks to bones broken into multiple pieces, and while they’re often caused by serious accidents, proper treatment can help restore full function of your arm.

Upper respiratory tract infections are among the most common illnesses worldwide, affecting millions of people every year. While these infections can be uncomfortable and disrupt daily life, most are caused by viruses and resolve on their own with proper care and rest.

Urea cycle disorder is a group of rare genetic conditions that prevent the body from removing toxic ammonia from the blood. When ammonia builds up, it can cause serious brain damage and affect organ function, making these disorders life-threatening without proper treatment.

Ureteric cancer is a rare type of cancer that develops in the ureters, the tubes that carry urine from the kidneys to the bladder. Though uncommon, it most often affects older adults and is closely linked to bladder cancer, requiring careful monitoring and specialized treatment.

Urethral stenosis, also called urethral stricture, is a narrowing of the tube that carries urine out of your body. This narrowing makes it difficult and sometimes painful to urinate, and without treatment, it can lead to serious complications affecting your bladder and kidneys.

Urethral valves are a birth defect affecting only boys, where extra flaps of tissue block the tube that carries urine out of the body, potentially causing serious damage to the bladder and kidneys if left untreated.

Urinary incontinence, the involuntary loss of bladder control, affects millions of people worldwide, yet many suffer in silence due to embarrassment. While it becomes more common with age, it is not an inevitable part of getting older, and effective treatments are available to help you regain control and improve your quality of life.

Urinary tract infections are among the most common bacterial infections people experience, affecting millions each year. While these infections can be uncomfortable and disruptive, understanding the symptoms, causes, and treatment options can help you recognize when to seek care and how to reduce your risk.

Urticaria, commonly known as hives, affects about 20 percent of people at some time during their lives, causing intensely itchy, raised welts that appear suddenly and can last from minutes to months or even years.

Cholinergic urticaria causes small, itchy bumps to appear on your skin when your body temperature rises and you start to sweat, triggered by activities like exercise, hot showers, stress, or even eating spicy foods.

Chronic urticaria is a condition where itchy, raised welts appear on your skin at least twice per week for more than six weeks. For many people, the cause remains unknown, but treatments can help control symptoms and improve quality of life.

Usher’s syndrome is a rare genetic condition that affects both hearing and vision, and is the most common cause of combined deafness and blindness.

Uterine cancer is a disease in which cells in the uterus grow out of control. It is the most common cancer affecting the female reproductive system, and while it can be serious, many cases can be cured when detected early.

Uterine leiomyoma, commonly known as fibroids, are noncancerous growths that develop in or on the uterus and affect millions of women during their reproductive years. While many women experience no symptoms, others face significant challenges including heavy bleeding, pain, and complications affecting their quality of life.

Uterine leiomyosarcoma is a rare and aggressive cancer that develops in the muscle wall of the uterus, accounting for only 2% to 5% of all uterine cancers. Despite often being discovered in early stages, this challenging disease requires specialized treatment and long-term monitoring.

Uveal melanoma is the most common type of eye cancer in adults, yet it remains a rare disease affecting only about 5 people per million each year. Though small tumors can often be treated while preserving vision, this cancer carries a significant risk of spreading to other organs, making early detection and expert care essential.

Uveitis is inflammation inside the eye that can cause pain, redness, and vision problems. While it affects millions of people worldwide each year, early diagnosis and treatment can prevent serious complications, including permanent vision loss.