It is well documented that mycotoxins can cause many health problems in humans. You can find this information in any number of studies and medical textbooks.
Most people in the world have some sort of health issue that they struggle with. Health problems come in as many varieties as the people that they afflict, and they can range from the gravely serious to the simply annoying.
Sitting in the barber's chair can be a little awkward; a stranger is running their fingers over your head and standing at a distance that violates most people's conception of personal space.