10 most bizarre allergies

More than 50 million Americans suffer from allergies, but the root cause is not always pollen, peanuts and pet dander. These are some of the most common allergy triggers, but because an allergy is simply an immune response to a harmless substance, a person could conceivably be allergic to anything — even sex and water. Here's a look at some of the strangest allergies ever documented and how people cope with them.

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