There is no cure for the common cold. Scientists have only recently been able to identify the viruses that cause colds. Fortunately,colds generally clear up on their own in a few days. Keeping in good physical condition, getting plenty of rest and eating a healthy diet should help keep down your chances of catching a cold. Not smoking will help as well,sine smokers tend to have more respiratory infections. Taking care of yourself once you have a cold will help you prevent a more serious illness from developing.