Staying healthy
Learning Center
Cigar smoking: Safer than cigarette smoking?
Despite what you might think, cigars aren't that different from cigarettes. Like cigarettes, cigars contain nicotine, tobacco and cancer-causing chemicals.
Foot swelling during air travel: A concern?
Swelling of the leg or foot while flying is common and usually harmless.
Heart rate: What's normal?
A normal resting heart rate for adults ranges from 60 to 100 beats per minute. A heart rate above or below that may signal a problem.
Sitting risks: How harmful is too much sitting?
Sitting for long periods — such as in front of the TV or at a desk — appears to increase risk of death from cardiovascular disease and cancer.
Ocular migraine: When to seek help
Flashes of light, zigzagging patterns and temporary blindness — what does it all mean?
Macrocytosis: What causes it?
Enlarged red blood cells (macrocytosis) can be due to many factors.
VLDL cholesterol: Is it harmful?
Like LDL cholesterol, very-low-density lipoprotein (VLDL) cholesterol is considered a type of 'bad' cholesterol.
What's the difference between H1N1 flu and influenza A?
H1N1 flu is a subcategory of influenza A.
Discolored semen: What does it mean?
Find out what causes discolored semen.
Lung nodules: Can they be cancerous?
Lung nodules are common. Most aren't cancer. Find out what tests might be recommended if you have a lung nodule.
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