HowStuffWorks Videos "Physiology: Sex and Irritable Bowel Syndrome"

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Heart Effects (1:34)

Is it possible to treat hypertension in the heart and clear up scarring around the heart muscle with the same medicine? Watch this University of Florida research video to learn how doctors and scientists are excited about a new breakthrough.

Body Invaders: Headache Causes (4:35)

From the Discovery Health series "Body Invaders", Dr. Gil Spierings explains common causes of headaches.

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Physiology: Sex and Irritable Bowel Syndrome (5:06)

Gastroenterologist Dr. Lin Chang examines the social and sexual issues associated with irritable bowel syndrome (IBS).

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Human Atlas: Hepatitis (1:16)

Hepatitis is an infectious virus that attacks the liver. Immunization is available to help protect against some types of hepatitis. Watch this video to learn more about hepatitis.

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Human Atlas: Gall Stones II (1:27)

An estimated 16 to 20 million people in the United States have gall stones, but most of these stones are so tiny that they are flushed through the system without problem. Learn more about gall stones in this video.

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Extreme Bodies: Supersize Human (2:51)

On Discovery Channel's "Extreme Bodies," we meet Indiana Pacers center Roy Hibbert. Standing at 7 foot 2 inches, Roy's heart and lungs are two times the size of an average size person's.

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Extreme Bodies: Tallest Man Ever Recorded (2:38)

The tallest man ever recorded, Robert Wadlow, was 8 feet 11 inches. He died at an early age due to complications from his pituitary tumor. Learn more about Wadlow on Discovery Channel's "Extreme Bodies."

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Extreme Bodies: FBN1 Gene (2:46)

Meet Dave, a giant who, because of a mutation in his FBN1 gene, has skin covered with rashes and an abnormally small chest which makes it difficult for him to breathe. Learn more about this condition on Discovery Channel's "Extreme Bodies."

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Extreme Bodies: Excess Growth Hormone (2:55)

The pituitary gland produces human growth hormone in the human body. In some cases, it produces an excess amount and causes a person to grow abnormally tall. Learn more about this function on Discovery Channel's "Extreme Bodies."

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Extreme Bodies: Acromegaly (2:36)

Acromegaly is a condition that occurs when the pituitary gland produces an excess amount of growth hormone. This condition is commonly associated with pituitary giants. Learn more about acromegaly on Discovery Channel's "Extreme Bodies."

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Extreme Bodies: Physical Problems of Being Tall (2:40)

Being very tall can cause some physical problems. In this clip from "Extreme Bodies" on Discovery Channel, we meet 7 foot 5 inch, Richmond Edwards whose basketball career ended because his knees could not support his large size.

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Extreme Bodies: Familial Giants (2:34)

Unlike pituitary giants, the abnormal height of familial giants are not caused by any disorders. Meet a 12-year-old familial giant on Discovery Channel's "Extreme Bodies."

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Extreme Bodies: Craniotomy Surgery (2:07)

On Discovery Channel's "Extreme Bodies," watch as George Bell, a pituitary giant, undergoes a craniotomy -- a surgical procedure to have a tumor removed from his brain.

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