Reflux
One possible explanation of chronic laryngitis is that inflammation is caused by gastro-oesophageal reflux, which causes subsequent irritation of the vocal folds. Autoimmune disorders
Approximately between 30 and 75% of persons with rheumatoid arthritis report symptoms of laryngitis. Symptoms of laryngitis are present in only 0.5–5% of people that have sarcoidosis. According to a meta-analysis by Silva et al. (2007), this disease is often an uncommon cause of laryngeal symptoms and is frequently misdiagnosed as another voice disorder. Diagnosis
Diagnosis of different forms of acute laryngitis

Laryngitis following trauma: This form of laryngitis is usually identified by obtaining a case history providing information on previous phono traumatic experiences, internal trauma caused by recent procedures as well as any previous neck injuries. Acute viral laryngitis: This form of laryngitis is characterized by lower vocal pitch as well as hoarseness. The symptoms in this form of laryngitis are usually present for less than one week, however they can persist for 3–4 weeks. This form of laryngitis might also be accompanied by upper respiratory tract symptoms such as: sore throat, odynophagia, rhinorrhea, dyspnea, postnasal discharge, and congestion. Fungal laryngitis: A biopsy and culture of abnormal lesion may help confirm fungal laryngitis. Visual diagnosis
The larynx itself will often show erythema (reddening) and edema (swelling). This can be seen with laryngoscopy or stroboscopy (method depends on the type of laryngitis).
These should only be prescribed for a set period of time, after which the symptoms should be reviewed. Proton pump inhibitors do not work for everyone. A physical reflux barrier (e.g. Gaviscon Liquid) may be more appropriate for some. Antisecretory medications can have several side-effects.When appropriate, anti-reflux surgery may benefit some individuals. Inflammatory
When treating allergic laryngitis, topical nasal steroids and immunotherapy have been found to be effective for allergic rhinitis. Antihistamines may also be helpful, but can create a dryness in the larynx. Inhaled steroids that are used for a long period can lead to problems with the larynx and voice. Autoimmune
Mucous membrane pemphigoid may be managed with medication (cyclophosphamide and prednisolone). Granulomatous
Sarcoidosis is typically treated with systemic corticosteroids. Less frequently used treatments include intralesional injections or laser resection. Prognosis
Acute
Acute laryngitis may persist, but will typically resolve on its own within two weeks. Recovery is likely to be quick if the patient follows the treatment plan. In viral laryngitis, symptoms can persist for an extended period, even when upper respiratory tract inflammation has been resolved. Chronic
Laryngitis that continues for more than three weeks is considered chronic. If laryngeal symptoms last for more than three weeks, a referral should be made for further examination, including direct laryngoscopy. The prognosis for chronic laryngitis varies depending on the cause of the laryngitis. References
External links

Laryngitis at Curlie
Mayo Clinic