Most cases of laryngitis are triggered by a temporary viral infection and aren't serious. Persistent hoarseness can sometimes signal a more serious underlying medical condition.
In most cases laryngitis symptoms last less than a couple of weeks and are caused by something minor, such as a virus.
Laryngitis - Symptoms and causes - Mayo Clinic
The most common sign of laryngitis is hoarseness. Changes in your voice can vary with the degree of infection or irritation, ranging from mild hoarseness to almost total loss of your voice. If you have chronic hoarseness, your doctor may review your medical history and symptoms.
Laryngitis - Diagnosis and treatment - Mayo Clinic