Common cold: symptoms last up to two weeks; stuffy, runny nose, sore throat, cough. Treated with rest, fluids, over-the-counter medications. Seasonal flu: Symptoms usually last 1-2 weeks- high fever (100-102 degrees Fahrenheit) headache, aches and pains, weakness, exhaustion, cough, chest discomfort.Treated with rest, fluids, over-the-counter medications , prescription anti-viral drugs. Airborne Allergy Lasts as long as the allergens are present: stuffy, runny nose, itchy, watery eyes. Treated with antihistamines, decongestants, nasal steroids.