Generally, flu symptoms are far more severe. With colds, one can experience the gradual onset of symptoms, while flu signs can suddenly appear. Symptoms including a stuffy nose, sneezing, and sore throat too more commonly accompany colds than the flu. The flu also frequently comes with a fever, body aches and pains, and headaches. People with colds rarely get these, and their aches are typically mild if ever.
http://www.techtimes.com/articles/196885/20170211/winter-blues-are-you-having-a-cold-or-the-flu.htm
