The people leading a busy lifestyle tend to get sick more easily, since, due to the many responsibilities they have, they are likely to neglect both their diet and their health in general, causing the invasion of germs and bacteria.
Apart from that, the change of air, for example, in an office, or at home, is also a major cause of cough and common cold, but despite this, we must remember that a cold is a natural reaction of the body to an emergency, although that doesn´t change the fact that it is annoying to have that much phlegm all day long.