A Cambridge University team of scientists has theorized that men are more evolutionarily susceptible to infection than women, perhaps due to higher testosterone levels. However, the "man-flu" theory is controversial. That they are terrible patients, is not. [BBC]
I (obviously) haven't done a study on this or anything, but in my household, my husband claims he "never" gets sick. But he does—far more often than I do. And on the EXTREMELY RARE occasion that I do get sick, he acts like I'm sick all the time.
Is it their perception of their own strength and what strength actually means to them?