19 April

Cancer may actually be an infectious disease. Not because you can catch cancer (though that may happen at times too), but because you can catch the pathogens that possibly cause it. Number of sexual partners is one measure of that. Another hypothesis is that nearly all head and neck cancers are caused by pathogens acquired during oral sex. And yet another - hypochondriacs actually often have lower levels of chronic disease - a suggested explanation is their greater use of antibiotics.