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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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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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Coronary angiogram

Learn more about this heart disease test that uses X-ray imaging to see the heart's…

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Coronary angioplasty and stents

Coronary angioplasty and stents can open clogged blood vessels that deliver blood to heart muscles.

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Coronary artery bypass surgery

This major heart surgery, also called CABG, creates a new path for blood to flow…

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Coronary artery disease

Know the warning signs of this common heart condition often caused by clogged, narrowed arteries…

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Coronary artery disease: Angioplasty or bypass surgery?

The best treatment for coronary artery disease depends on the circumstances.

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Coronary artery spasm: Cause for concern?

This sudden, temporary squeezing of an artery reduces blood flow to the heart. Know the…

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Coronary calcium scan

This heart CT test can show calcium deposits in the blood vessels. Know how the…

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Coronavirus disease 2019 (COVID-19)

Coronavirus disease 2019 (COVID-19) is an illness caused by the virus SARS-CoV-2. Learn more about…

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Coronavirus: What is it and how can I protect myself?

Coronavirus disease 2019 (COVID-19) is caused by a virus that spreads between people. Find out…

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Corticobasal degeneration (corticobasal syndrome)

Learn about this rare disease that affects brain cells. The disease can make it hard…

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Cortisone shots

These shots can help relieve pain, swelling and irritation. Potential side effects generally limit the…

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Cosmetic surgery

The goal of this type of surgery is to improve your appearance. It can involve…

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Costochondritis

This chest wall pain, caused by inflammation, often improves on its own.

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Cough

This is the body's response when the throat or airways are irritated. Coughing once in…

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Cough headaches

Often triggered by coughing and other types of straining, these headaches can be harmless or…

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Coughing more after quitting smoking: What's the deal?

If you cough more than usual after you give up cigarettes, find out what it…

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