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The familiar sounds of your heart are made by the heart's valves as they open and close.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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A headache when you wake up in the morning is indicative of sinusitis. Other symptoms of sinusitis can include fever, weakness, tiredness, a cough that may be more severe at night, and a runny nose or nasal congestion.
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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.