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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.

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Colchicine is a highly poisonous alkaloid originally extracted from a type of saffron plant that is used mainly to treat gout.

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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%

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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.

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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.

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