Ladies, have you ever noticed that every time a man gets sick, he acts like it's the end of the world? Though he's probably exaggerating a little bit, there may be some scientific evidence behind his feelings so don't be too quick to judge.

Sometimes when men get a bug or flu-like symptoms, it can be downright debilitating. Men claim to feel symptoms more harshly than the opposite sex. To women's disbelief, this has been dubbed the "Man Flu."

According to research from Live Science, the flu actually hits men harder than women. This happens because men's immune systems are slightly weaker when it comes to respiratory viruses. Though doctor's don't have an absolute answer to why this is, they believe it may have something to do with our estrogen levels.

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The next time us guys can't go to work or watch the kids we can blame it on evolution. Estrogen helps fight off many viruses and men have significantly lower levels. It all goes back to the early days. Men were designed with more testosterone to fight off mastodons and saber-toothed tigers. (Insert Tim Allen grunt here).

Ladies, the next time your man gets sick. Don't question his manliness. We have an evolutionary design flaw... or two... or three...