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Kidney cysts

These round, fluid-filled pouches on or in the kidneys are sometimes discovered during imaging tests….

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Kidney dialysis: When is it time to stop?

Many factors may influence the decision to withdraw from kidney dialysis.

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Kidney donation: Are there long-term risks?

Kidney donation can save a life, but it's important to understand the risks.

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Kidney infection

A urinary tract infection that travels to the kidneys can be dangerous. Know the symptoms…

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Kidney pain

Find out how this type of pain may feel and what health problems can cause…

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Kidney stones

Learn about the symptoms, risks, causes and treatment of this often intensely painful condition.

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Kidney transplant

Find out about the different types of kidney transplants — surgeries that are done to…

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Kleptomania

If you have this impulse control disorder, you can't resist urges to steal items that…

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Klinefelter syndrome

In this condition, a genetic male has an extra X sex chromosome. This may affect…

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Klippel-Trenaunay syndrome

Main signs of this congenital disorder involve a red birthmark (port-wine stain), vein malformations, and…

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Knee bursitis

This condition involves painful swelling of a small fluid-filled sac near the knee joint. It…

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Knee pain

Learn about this common complaint, which can result from an injury or medical condition, and…

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Knee pain: Symptom

Knee pain: Symptom — Overview covers definition, possible causes of knee joint pain.

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Knee replacement

Knee replacement surgery can relieve pain and restore function to a knee joint that's seriously…

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Kombucha tea: Does it have health benefits?

Does kombucha tea live up to its reputation as a health tonic?

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Kratom for opioid withdrawal: Does it work?

Kratom is promoted as an aid in overcoming withdrawal from opioid medications, but research suggests…

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Kratom: Unsafe and ineffective

Users claim kratom lifts mood and boosts energy, but there are many safety issues and…

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Kyphosis

This excessive forward rounding of the back is often caused by osteoporosis in older women….

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L-arginine

Understand how L-arginine affects blood vessels and when to avoid using this supplement.

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L-arginine: Does it lower blood pressure?

This supplement may help some people lower their blood pressure. Learn who might benefit and…

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Labor and delivery: Pain medications

Understand the pros and cons of various labor and delivery pain medications.

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Labor induction

Know what to expect during this procedure to start labor before it begins on its…

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Labor positions

Learn about positions that might help you relax and ease pain during labor.

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Lack of sleep: Can it make you sick?

Not getting enough sleep can affect your immune system. Here's what you need to know.

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Lactose intolerance

Tummy upset after that milkshake? Not being able to fully digest the lactose in dairy…

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Laminectomy

Removing the rear part of a vertebra, called the lamina, makes extra space in the…

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Language development: Speech milestones for babies

Get the facts about how baby learns to speak.

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Laryngitis

Learn about the symptoms, causes and treatment for this common swelling of the voice box.

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Laryngospasm: What causes it?

Laryngospasm is a brief spasm of the vocal cords, which temporarily interrupts breathing.

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Laryngotracheal reconstruction

This surgery widens the windpipe or voice box to make breathing easier. Learn why it's…

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