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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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Complications of influenza include: bacterial pneumonia, ear and sinus infections, dehydration, and worsening of chronic conditions such as asthma, congestive heart failure, or diabetes.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.