Heat exhaustion may also produce a feeling of sickness, a fast heartbeat,breathing problems and pain in the head,chest or stomach.

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Acute pain happens fast and usually lasts a short time.

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And labor, with accompanying pain, fast heartbeat and hormonal changes, "that's the most dangerous and challenging time, " Dr. Franklin says.

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But plenty of investors would probably like to buy, say, a fast-growing pain or vaccine business and skip the less attractive parts of the company.

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But one bad hit forced Pear to retire, only to discover that after years of playing through pain and injury, his body was deteriorating fast, and his pension evaporating even faster.

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