Men Big Babies When it Comes to Pain? Here's Why

We all know men are babies when it comes to pain (sorry, guys!).  But there may be a reason for it.

A new study has revealed that the pain "circuitry" of men and women is different.  According to newswise.com, new research released today reveals for the first time that pain is processed in male and female mice using different cells.

"Research has demonstrated that men and women have different sensitivity to pain and that more women suffer from chronic pain than men, but the assumption has always been that the wiring of how pain is processed is the same in both sexes,” says co-senior author Jeffrey Mogil, Ph.D., E.P. Taylor professor of pain studies at McGill University and director of the Alan Edwards Centre for Research on Pain.

I've been through major cancer surgery, many surgical biopsies, a c-section, eight stitches from falling and cutting my eye while running, and now am dealing with a kidney stone.  My husband, who had laser knee surgery years ago (and won't go back for any more of any kind) carried on for months afterwards.

Sorry, Larry.

 The research was conducted by teams from McGill University, The Hospital for Sick Children (SickKids), and Duke University, and looked at the longstanding theory that pain is transmitted from the site of injury or inflammation through the nervous system using an immune system cell called microglia. This new research shows that this is only true in male mice. Interfering with the function of microglia in a variety of different ways effectively blocked pain in male mice, but had no effect in female mice.

According to the researchers, a completely different type of immune cell, called T cells, appears to be responsible for sounding the pain alarm in female mice. However, exactly how this happens remains unknown.

“Understanding the pathways of pain and sex differences is absolutely essential as we design the next generation of more sophisticated, targeted pain medications,” says Michael Salter, M.D., Ph.D., Head and Senior Scientist, Neuroscience & Mental Health at SickKids and Professor at The University of Toronto, the other co-senior author. “We believe that mice have very similar nervous systems to humans, especially for a basic evolutionary function like pain, so these findings tell us there are important questions raised for human pain drug development.”

So that Tylenol works better on me than him?

That seems to be what they're saying.  

"For the past 15 years, scientists have thought that microglia controlled the volume knob on pain, but this conclusion was based on research using almost exclusively male mice,” says Mogil. “This finding is a perfect example of why this policy, and very carefully designed research, is essential if the benefits of basic science are to serve everyone.”


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