Hoarse voice.

Various causes of hoarse voice are briefly discussed in this article. As it is not possible to give a detailed account of all the causes of this important condition affecting the larynx, any patient with persistent hoarseness of more than four weeks' duration should have his larynx thoroughly examined. The head mirror, suitable light source, laryngeal mirror, spirit lamp, pierce of gauze and a local anaethetical spray is all that is required to carry out a mirror examination of the larynx.