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For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.

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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

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Women are 50% to 75% more likely than men to experience an adverse drug reaction.

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

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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.

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