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    Gender: Some Painstaking Differences

    Feeling Your Pain

    Feeling Your Pain

    The challenging part will be teasing out the rest of the information -- including how men and women perceive pain and the physiological/social aspects of pain. But in financial terms it certainly will be worthwhile. The annual cost of pain in the U.S. is roughly $100 billion, including 515 million lost workdays, according to the American Pain Foundation. Approximately 25 million Americans suffer from acute pain due to injuries or surgery.

    Laboratory studies show a clear difference in pain tolerance levels between men and women. When healthy men and women are subjected to heat and other types of pain tests, women almost always report feeling discomfort first.

    "It takes a lower temperature for a women to tell you that this feels painful," says Roger Fillingim, PhD, associate professor in the college of dentistry at the University of Florida, in Gainesville. "The laboratory studies show rather convincingly that women have a lower pain threshold and pain tolerance than men. That has been fairly consistently shown in the experimental studies that have been done."

    To measure the differences in pain tolerance between men and women, Fillingim uses something called effect size, which compares the differences between the groups to the differences within each group. On a scale of small, moderate, and large, the pain tolerance difference between men and women is considered moderate. In degrees centigrade that translates to a difference of one degree to a degree and a half.

    "So they are not so great that you would say, 'Here comes a women and she will have more pain no matter what else is going on,'" he says. "It is also not so small that they should be ignored for other factors."

    Those findings actually prompt as many questions as they answer. For instance, researchers want to know, what role does a woman's menstrual cycle play in her perception of pain? It must play some part, says Sherry Marts, scientific director for the Society for Women's Health Research in Washington, D.C. For example, she says, women know not to get their legs waxed right before their period because it is much more painful than at other times in their cycle.

    "Something in the hormonal factor is affecting the perception of the pain," says Marts.

    Fillingim agrees, adding that laboratory research suggests that during the premenstrual phase women are more sensitive to most types of painful stimuli than during other phases of their cycle.

    "So there are a lot of complicated interactions among different systems of the body rather than just estrogen going up and down," he says.

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