Sleep
Learning Center
Melatonin side effects: What are the risks?
Melatonin is generally safe for short-term use but can cause side effects.
How many hours of sleep are enough?
Wonder how many hours of sleep are enough? A Mayo Clinic specialist offers guidelines.
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.
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.
Gallbladder polyps: Can they be cancerous?
The size of gallbladder polyps can be a useful predictor of whether they're cancerous.
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