Some of the common myths are
1) Cold Causes a Cold
the body temperature (or ambient temperature) makes no difference at all. You catch a cold when you come into contact with the cold virus – once the virus gets into your system you will get sick. It doesn’t matter if you are hot, cold, warm, or dry.
2) Weak Immune System
A weakened immune system does not heighten the risks of catching a cold. Healthy and unhealthy people exhibit the same amount of susceptibility to colds
3) Sweat it out
covering up with extra blankets, sticking your head over a bowl of hot water – all in the hopes that we will sweat the cold out is complete ineffective
4) Flu Shot Dangers
The vaccine actually includes only components of the virus, and not a complete version of it. Therefore, you won’t catch the flu from a flu shot.
5) Vitamin C
It is a myth that loads of vitamin c and zinc help to stave off (or cure) a cold.
6) Winter Colds
We can catch colds at any time of year however during cold weather we stay in doors more, keep windows and doors shut and have heated moist air in the room all of which promotes spreading the virus
7) Don’t Drink Milk
milk does not cause a build up of mucous – you can drink as much of it as you like and it will have no effect on your cold.
8) Cold Kissing
the quantity of virus on the lips and mouth are miniscule and a much larger dose would be required for you to become infected. It is the nasal mucous you have to worry about
9) Don’t Treat Cold Symptoms
the symptoms not only make no difference to the duration of the cold, they can help spread the bug to other people – through noseblowing and coughing. You should take comfort in knowing that pain killers and other cold medicines will not only make the illness more tolerable, they will help to keep it contained.
10) Starve a Fever
Eating has no negative impact on the body when you are sick, in fact, the opposite is true. Food provides the body with fuel to cope with illness
http://listverse.com/2008/11/05/top-10-myths-about-the-common-cold/