India, Nov. 25 -- Do wet hair make you ill? Does a cold shower ward off a cold? As winter bites, this fact check will help you separate persistent myths from science. Berlin (dpa) - Not everything we say about our health in cold weather is true. Time to sort the myths from the science. Belief: Wet hair in the cold makes you ill False.Colds are always caused by viruses, not by cold alone or wet hair in chilly weather. Without contact with a pathogen, there is no infection. Studies do show that strong cooling of the body surface, for example through wet clothing or cold air, can reduce blood flow in the mucous membranes. This can weaken local defences and allow existing viruses to multiply more easily. Keeping warm can sometimes help, but a c...