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An upper respiratory tract infection (URTI) is an illness caused by an acute infection, which involves the upper respiratory tract, including the nose, sinuses, pharynx, larynx or trachea. [ 3 ] [ 4 ] This commonly includes nasal obstruction, sore throat, tonsillitis , pharyngitis , laryngitis , sinusitis , otitis media , and the common cold .
An infection of this type usually is further classified as an upper respiratory tract infection (URI or URTI) or a lower respiratory tract infection (LRI or LRTI). Lower respiratory infections, such as pneumonia , tend to be far more severe than upper respiratory infections, such as the common cold .
Upper respiratory tract infections (URTIs) often precede acute bronchitis, with overlapping symptoms including headache, nasal congestion, and sore throat. About a third of patients will experience a fever, but fevers due to acute bronchitis rarely rise above 100 °F (37.8 °C) or last longer than a few days. [14]
Pneumonia frequently starts as an upper respiratory tract infection that moves into the lower respiratory tract. [55] It is a type of pneumonitis (lung inflammation). [56] The normal flora of the upper airway give protection by competing with pathogens for nutrients.
[4] [19] Other symptoms may include coughing up mucus, wheezing, shortness of breath, fever, and chest discomfort. [6] Fever when present is mild. [20] The infection may last a few to ten days. [6] The cough may persist for several weeks afterwards, with the total duration of symptoms usually around three weeks. [4] [6] Symptoms may last for up ...
The common cold or the cold is a viral infectious disease of the upper respiratory tract that primarily affects the respiratory mucosa of the nose, throat, sinuses, and larynx. [ 6 ] [ 8 ] Signs and symptoms may appear in as little as two days after exposure to the virus. [ 6 ]
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