Causes of acute laryngitis are represented by viral infection of the larynx, which can be isolated, or accompany a rhinitis, pharyngitisor tracheitis (inflammation of the trachea). Bacterial infections of the larynx are rare. Acute laryngitis may be the result of inhalationof irritant gas.
Acute Laryngitis child is explained by a significant reduction in airflow in the upper airways, caused by a laringotraheita(inflammation of the larynx and trachea), due to a viral infection.The agent responsible is the most commonly parainfluenza virustype 1. More rarely, other viruses may be involved - for example,respiratory syncytial virus (RSV).
Chronic laryngitis persists for more than a week and reappearperiodically. This disorder train in some cases permanent changesin the lining, which may explain the repeated attacks of acutelarinigita. Mucosal changes are sometimes the result of repeated exposure to cigarette smoke, dust, dry air or other irritants.
Chronic laryngitis can be caused by allergies or gastroesophagealreflux (regurgitation of acid from the stomach, resulting in a burning sensation). In rare cases, chronic laryngitis is caused by laryngealcancer, vocal cord benign tumor or cancerous lesions like warts,called papillomas.
Other causes are:
- Excessive use of the vocal chords, common in someprofessions (musicians, teachers, etc.)
- excessive consumption of tobacco
- infections (dental, etc.).
- Allergies
- laryngeal tuberculosis
- tertiary syphilis
- precancerous lesions
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