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10 extremely unusual allergies

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Exercise

Though it might seem like a great excuse to avoid the gym, anyone suffering from an exercise allergy will tell you it's not as convenient as it sounds. Symptoms of this condition—which is called exercise-induced anaphylaxis and urticaria––can range from hives and gastrointestinal problems to life-threatening anaphylaxis. Treatment options include abstaining from physical activity and taking medications like antihistamines and mast cell stabilizers.