There are many plausible reasons for how<unk><unk>  and other vocal disorders occur, but it can not be determined for certain due to the many factors that play a role in speech production. Voice production requires the coordination of many muscles and other structures in the larynx. Many factors can cause the larynx to become tensed which changes the position of larynx. This affects the cartilaginous structures within the larynx leading to abnormal phonation.<unk><unk>  refers to an unnaturally deep voice, so when lowering their voice, individuals may continue to speak even when the air in their lungs has been almost entirely expelled. Due to the effort exerted in lowering the pitch range, the muscles involved in respiration become tensed and strained along with speech.<unk>  is considered a secondary muscle tension dysphonia disorder, meaning that there is an abnormality in the voice box that causes the overuse of muscles to help produce your voice. This abnormality can be caused by an underlying medical reason or a physical exertion. By lowering vocal pitch, the larynx compresses the vocal folds which regulate air flow and production of the sounds used in speech which can cause damage to these muscles over time. Vocal fold lesions or nodules can cause changes in the vocal fold mucosa which leads to increased tension in the larynx, ultimately causing dysphonia. thumb
Bogart–Bacall syndrome
Michels Caskey syndrome
Papillon–Lefèvre syndrome
Jeavons syndrome
Bonnet–Dechaume–Blanc syndrome
Rudiger syndrome
McGillivray syndrome
Teunissen–Cremers syndrome