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Lazy eye (amblyopia)
Abnormal visual development early in life can cause reduced vision in one eye, which often wanders inward or outward.
Knee pain
Learn about this common complaint, which can result from an injury or medical condition, and find out which treatments may help.
Klippel-Trenaunay syndrome
Main signs of this congenital disorder involve a red birthmark (port-wine stain), vein malformations, and overgrowth of tissues and bones.
Klinefelter syndrome
This genetic disorder occurs when a male is born with an extra copy of the X chromosome and may result in low testosterone production and infertility.
Kidney cancer
Learn about the symptoms and causes of kidney cancer and renal cell carcinoma. Find out about treatments, such as nephrectomy and immunotherapy.
Juvenile idiopathic arthritis
Learn about this type of arthritis that affects children and can cause growth problems, joint damage and eye inflammation.
Iritis
Learn about who's at risk of this eye condition and why you should get treatment right away if you have symptoms.
Intermittent explosive disorder
This mental health condition involves sudden bouts of impulsive, aggressive, violent behavior or verbal outbursts that cause major distress in life.
Inherited metabolic disorders
Caused by gene changes, these disorders affect the body's ability to change food into energy. They also affect how energy is used, such as for cell repair.
Influenza (flu)
Learn more about the symptoms, causes and prevention of this potentially fatal viral infection that attacks the respiratory system.
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