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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
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If you could remove all of your skin, it would weigh up to 5 pounds.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.