Most cases of laryngitis are short-lived and improve when the underlying cause gets better. Causes of acute laryngitis include:
- viral infection, such as a cold or flu
- vocal strain, caused by overuse or yelling
- bacterial infection, although this is less common.
Laryngitis that lasts longer than 3 weeks is known as chronic laryngitis. It is generally caused by irritation over a long time, eg, from:
- exposure to irritating substances, such as cigarette smoke, excessive alcohol intake, stomach acid or workplace chemicals
- overusing your voice, by speaking too much, speaking too loudly, shouting or singing.