+URI, seasonal allergies, influenza: symptom comparison Symptoms Allergy<unk>  (Common Cold) Influenza (Flu) Itchy, watery eyes Common Rare (conjunctivitis may occur with adenovirus) Soreness behind eyes, sometimes conjunctivitis Nasal discharge Common Common Common Nasal congestion Common Common Sometimes Sneezing Very common Very common Sometimes Sore throat Sometimes (post-nasal drip) Very common Sometimes Cough Sometimes Common (mild to moderate, hacking) Common (dry cough, can be severe) Headache Uncommon Rare Common Fever Never Rare in adults, possible in children Very common37.8–38.9 °C (100–102 °F)(or higher in young children), lasting 3–4 days; may have chills Malaise Sometimes Sometimes Very common Fatigue, weakness Sometimes Sometimes Very common (can last for weeks, extreme exhaustion early in course) Muscle pain Never Slight Very common (often severe) Classification A<unk>  may be classified by the area inflamed. Rhinitis affects the nasal mucosa, while rhinosinusitis or sinusitis affects the nose and paranasal sinuses, including frontal, ethmoid, maxillary, and sphenoid sinuses. Nasopharyngitis (rhinopharyngitis or the common cold) affects the nares, pharynx, hypopharynx, uvula, and tonsils generally. Without involving the nose, pharyngitis inflames the pharynx, hypopharynx, uvula, and tonsils. Similarly, epiglottitis (supraglottitis) inflames the superior portion of the larynx and supraglottic area; laryngitis is in the larynx; laryngotracheitis is in the larynx, trachea, and subglottic area; and tracheitis is in the trachea and subglottic area.
Upper respiratory tract infection
Carbon monoxide poisoning
Lower respiratory tract infection
Respiratory tract infection
Post-viral cough
Allergic rhinitis
Croup
Bronchorrhea