Causes of Vocal Fatigue by David Jones (2001) VoiceTeacher.com.

Causes:

(1) Smoking or drinking alcoholic beverages.

(2) Belting: using too much chest voice pushed up to high in the scale.

(3) Using a technique with a tight solar plexus during singing.

(4) Singing with a high larynx.

(5) Singing with a low soft palate.

(6) Singing with a forward jaw position.

(7) Singing with the vocal cords too far apart or too squeezed together.

(8) Pushing too much breath pressure through the larynx.

(9) Incorrect posture; dropped chest or hyper-extended chest.

(10) Singing with the head posture pushed forward from the spine.

(11) Use of mouth vowels instead of pharyngeal vowels.

(12) Unsupported singing; lack of connection to the resistance of breath pressure in the lower back and abdominal muscles.

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