It seems it's really true, men are much worse at being sick than women. If you are a woman living with a man who gets a cold or flu you probably recognize this. And here we just believed men were good actors when sick.
The study found in the simplest form: "It isn’t always the presence of the microbe or the presence of the virus that makes us sick. It’s the immune response, and the research shows that males have a heightened response that summons cells to the site of infection, which contributes to the overall feeling of sickness.”
So I guess we women have to be more sincerely sympathetic.