The same outdoor allergens that cause sneezing can also cause itchy skin in some people, according to the American College of Allergy, Asthma and Immunology. Allergic rhinitis, also known as hay fever, can manifest with runny or stuffy nose and fatigue as well.
Despite its name, hay fever isn't necessarily triggered by exposure to hay. Pollens from weeds, grass and trees can set it off, as can various indoor allergens, including dust mites, mold and pet dander. Cigarette smoke, diesel exhaust and perfume can also trigger allergic rhinitis with its symptoms of sneezing and itchy skin, notes the American College of Allergy, Asthma and Immunology. Avoiding allergens is one of the key ways to combat allergic rhinitis, which can also be treated with decongestants, antihistamines and allergy shots.