These round, fluid-filled pouches on or in the kidneys are sometimes discovered during imaging tests. Find out when treatment may be needed.
Disease
Kidney infection
A urinary tract infection that travels to the kidneys can be dangerous. Know the symptoms and when to get prompt medical treatment.
Disease
Kidney stones
Learn about the symptoms, risks, causes and treatment of this often intensely painful condition.
Disease
Kleptomania
If you have this impulse control disorder, you can't resist urges to steal items that you generally don't really need and that usually have little value.
Disease
Klinefelter syndrome
In this condition, a genetic male has an extra X sex chromosome. This may affect the growth of testicles and result in low testosterone.
Disease
Klippel-Trenaunay syndrome
Main signs of this congenital disorder involve a red birthmark (port-wine stain), vein malformations, and overgrowth of tissues and bones.
Disease
Knee bursitis
This condition involves painful swelling of a small fluid-filled sac near the knee joint. It causes pain and can limit movement.
Disease
Knee pain
Learn about this common complaint, which can result from an injury or medical condition, and find out which treatments may help.
Disease
Kyphosis
This excessive forward rounding of the back is often caused by osteoporosis in older women. Spinal malformations can cause kyphosis in infants or teens.
Disease
Polycystic kidney disease
Learn how treatments and lifestyle changes might help reduce kidney damage from this disease.
Disease
Seborrheic keratosis
Learn more about the symptoms and treatments of this common, noncancerous skin growth that gradually appears as you age.
Disease
Swollen knee
This condition can be caused by trauma, overuse injuries, or an underlying disease or condition. A fluid sample from the knee may be needed for diagnosis.