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COPD
This chronic inflammatory lung disease causes obstructed airflow from the lungs, resulting in breathing difficulty, cough, mucus production and wheezing.
Cancer
Find out the basics about cancer, including symptoms, causes and treatments. Learn steps you can take to prevent cancer.
Carbon monoxide poisoning
This gas has no color, odor or taste. It can be deadly. Learn how to prevent it.
Carcinoma of unknown primary
In this uncommon and aggressive type of cancer, doctors aren't sure where the cancer began. Learn how they determine which treatments are most likely to help.
Cardiogenic shock
Most often the result of a severe heart attack, this rare condition can be deadly if not treated immediately.
Cavernous malformations
Understand the symptoms that may occur when blood vessels in the brain or spinal cord are tightly packed and contain slow-moving blood.
Cervical cancer
Screening with Pap tests can reduce the risk of this cancer that begins in the cervix. Learn more about symptoms, causes, prevention and treatment.
Chest pain
Pain in the chest has many possible causes — and some of them are serious. Here's why it's so important to see your health care provider about chest pain.
Chickenpox
Learn more about preventing this once-common childhood illness. Also, find out how to recognize and manage it.
Chlamydia trachomatis
This common sexually transmitted infection (STI) can lead to serious health problems if left untreated. Learn more about symptoms, treatment and prevention.
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