Why we get cough,cold and sour throat and how to avoid them?

Virus infections: Nearly everyone gets viral infection(from the air) and that causes sore throat running nose and cough. It is unavoidable except to keep yourself healthy by sleeping 7-8 hours daily and eat lots of fruits and vegetable so that you get a good amount of Vitamin-C in your body daily. That may reduce the number of such episodes per year(one or two colds in a year is quite normal)