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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
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Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.
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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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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.