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Complex regional pain syndrome

Learn about this neurological condition that may affect an arm or a leg after an…

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Complicated grief

In complicated grief, painful emotions of loss don't improve with time and are so severe…

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Compulsive gambling

Also called gambling disorder, compulsive gambling is the uncontrollable urge to keep gambling despite the…

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Compulsive sexual behavior

Also called sexual addiction, this means being obsessed with sexual fantasies, urges, or behaviors that…

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Computer-assisted brain surgery

Learn how computer-assisted brain surgery uses advanced imaging to create a 3D model of your…

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Computerized tomography (CT) urogram

Learn more about this imaging exam used to diagnose urinary tract disorders.

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Concussion

This brain injury can cause headaches, dizziness, trouble concentrating and other symptoms that often improve…

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Concussion in children: What are the symptoms?

Whether your child's concussion is mild or severe, allow time to recover.

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Concussion testing and screening tools

These screening tools help measure brain function after head trauma and help athletes at risk…

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Congenital adrenal hyperplasia

This group of inherited genetic conditions limits the adrenal glands' ability to make certain vital…

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Congenital diaphragmatic hernia (CDH)

In CDH, a baby's diaphragm — the muscle that separates the chest from the abdomen…

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Congenital heart defects in children

Learn about symptoms, tests and treatments for children born with a problem in the structure…

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Congenital heart disease in adults

A heart problem present at birth may not cause symptoms until adulthood. Learn how adult…

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Congenital mitral valve anomalies

These heart conditions present at birth cause the mitral valve to leak or become narrowed.…

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Congenital myasthenic syndromes

These rare hereditary conditions result in a problem in nerve stimulation, causing muscle weakness that…

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Conjoined twins

If an early embryo only partially separates and two babies develop, they remain physically connected…

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Constipation

Learn how to prevent and treat infrequent or painful passing of stool.

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Constipation in children

Learn what could cause constipation in your child, what you can do to prevent it…

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Contact dermatitis

Contact with certain substances, such as poison ivy, skin lotions and detergents, can cause an…

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Contraceptive implant

Learn about the benefits, risks and effectiveness of this type of long-acting, reversible birth control.

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Convalescent plasma therapy

Convalescent plasma therapy uses blood from people who've recovered from an illness, such as COVID-19,…

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COPD

This ongoing lung disease limits airflow into and out of the lungs. This results in…

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Coping with anxiety: Can diet make a difference?

Coping with anxiety is a challenge. Eating habits may play a role.

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Coping with pain after breast surgery

Pain is common after mastectomy and other breast operations. Find out what causes it and…

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Copper IUD (ParaGard)

This intrauterine device offers a hormone-free option for long-acting, reversible birth control.

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Core exercises: Why you should strengthen your core muscles

Core exercises strengthen your abs and other core muscles for better balance and stability.

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Core exercises: Why you should strengthen your core muscles

Core exercises strengthen your abs and other core muscles for better balance and stability.

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Cornea transplant

This procedure uses donor tissue to restore vision and reduce pain from cornea disease. Our…

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Corneal abrasion (scratch): First aid

How to administer first aid for a corneal abrasion.

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Corns and calluses

Find out more about these hardened areas of skin that often affect the feet and…

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