What things cause dust mites an what effects do they have on our health?

What things cause dust mites an what effects do they have on our health?
Higher than 40 percent humidity
Live in cloth
Live in curtains an clothes
They fart a gas that causes us to feel tired
They give us watery eyes
They make us feel like we have colds
They live in bedding
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What things cause dust mites an what effects do they have on our health?
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