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Laryngitis is categorized as acute if it lasts less than 3 weeks and chronic if symptoms last more than 3 weeks. [1] Acute cases usually occur as part of a viral upper respiratory tract infection, [1] other infections, and trauma such as from coughing or other causes. [1]
Laryngitis can be a short term illness or a prolonged problem. The majority of cases of laryngitis are due to viral infections that only last a few days. Laryngitis is often a common complaint in individuals who sing. Opera singers or those who yell at sporting events strain the throat muscles and develop a case of laryngitis.
[3] [4] This commonly includes nasal obstruction, sore throat, tonsillitis, pharyngitis, laryngitis, sinusitis, otitis media, and the common cold. [5]: 28 Most infections are viral in nature, and in other instances, the cause is bacterial. [6] URTIs can also be fungal or helminthic in origin, but these are less common. [7]: 443–445
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Viruses that cause respiratory infections are affected by environmental conditions like relative humidity and temperature. Temperate climate winters have lower relative humidity, which is known to increase the transmission of influenza. [29] Of the viruses that cause respiratory infections in humans, most have seasonal variation in prevalence.
Strep throat is a common bacterial infection in children. [2] It is the cause of 15–40% of sore throats among children [7] [13] and 5–15% among adults. [8] Cases are more common in late winter and early spring. [13] Potential complications include rheumatic fever and peritonsillar abscess. [1] [2]
Epiglottitis is a bacterial infection of the larynx which causes life-threatening swelling of the epiglottis with a mortality rate of 7% in adults and 1% in children. [10] Haemophilus influenzae is still the primary cause even with vaccinations. Also Streptococcus pyogenes can cause epiglottitis.
[1] [6] Symptoms usually last 3–5 days, but can be longer depending on cause. [2] [3] Complications can include sinusitis and acute otitis media. [2] Pharyngitis is a type of upper respiratory tract infection. [7] Most cases are caused by a viral infection. [2] Strep throat, a bacterial infection, is the cause in about 25% of children and 10% ...