Typically, colds are mild, last between 1 and 2 weeks, and go away without treatment. However, many differences exist. Allergies may produce abundant nasal secretions, but these are usually clear, rather than the green or yellow discharge of a viral infection or cold. Also, allergies often mean itchy eyes and nose, with constant sneezing, but without the other symptoms common to a cold. Finally, how long the symptoms last may help you tell whether you have a cold or an allergy.
Most colds go away within a couple of weeks.
If you think you might have seasonal allergies, see your doctor to find out what treatment is best for you. Always consult your own doctor about any opinions or recommendations with respect to your symptoms or medical condition. Beth Israel Deaconess Medical Center .