Colds are caused by viruses; allergies are caused by an immune reaction to triggers like pollen, dust, or pet dander
Colds often include fever; allergies usually do not
Colds often cause body aches; allergies usually do not
Colds usually last about 7 to 10 days; allergies can last as long as you are exposed to the trigger
Colds may start with a sore throat; allergies more often cause itchy eyes, nose, or throat
Colds often cause thicker or colored mucus; allergies usually cause clear, watery mucus
Colds may cause fatigue; allergies more often cause sneezing and itching
Colds are more likely to spread from person to person; allergies are not contagious
Colds can cause coughing and chest discomfort; allergies more often cause repeated sneezing and nasal congestion
Allergies often happen seasonally or around specific triggers; colds can happen any time of year