Allergies often cause itchy eyes, nose, or throat; colds usually do not
Allergies usually cause clear, watery nasal discharge; colds often cause thicker mucus
Allergies can start suddenly after exposure to triggers like pollen, dust, or pets; colds usually develop gradually
Allergies do not usually cause fever; colds can sometimes cause a mild fever
Allergies often last as long as exposure continues; colds usually improve within 7 to 10 days
Allergies are not usually associated with body aches; colds can cause mild body aches
Allergies often cause repeated sneezing; colds may cause sneezing but usually with other symptoms like sore throat or congestion
Allergies may come with seasonal patterns; colds can happen any time of year
Allergies are not contagious; colds are contagious
Allergies often respond to antihistamines; colds usually do not improve much with antihistamines