Fitness basics
Learning Center
Cervical length: Why does it matter during pregnancy?
If cervical length during pregnancy shortens too soon, there might be an increased risk of preterm labor.
Chelation therapy for heart disease: Does it work?
Learn more about this debated treatment for heart disease.
Chemotherapy and sex: Is sexual activity OK during treatment?
Chemotherapy and sex aren't mutually exclusive, as long as you're feeling up to it.
Chemotherapy side effects: A cause of heart disease?
Chemotherapy side effects may include a risk of heart problems, including weakened heart muscle (cardiomyopathy) and heart rhythm problems (arrhythmia).
Chickenpox and pregnancy: What are the concerns?
Understand the risks posed by chickenpox during pregnancy.
Cholesterol level: Can it be too low?
A high cholesterol level is unhealthy — rarely, very low cholesterol may pose risks, too.
Cholesterol ratio or non-HDL cholesterol: Which is most important?
Non-HDL cholesterol may be more important than cholesterol ratio.
Cholesterol test kits: Are they accurate?
Home cholesterol test kits are often as accurate as the test a health care professional uses, but the quality of results can depend on how well you follow the directions for the test.
Chronic bladder infection: Is there a cure?
Chronic bladder infection can be a painful, frustrating problem. Learn about causes and treatments.
Chronic diarrhea: A concern after gallbladder removal?
Diarrhea is fairly common after gallbladder removal. Find out what to expect.
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