Stress can lead to forceful voice production, resulting in possible tissue damage. Relaxation techniques can improve your voice and allow you to speak more effectively and longer. Caffeine and alcohol dehydrate vocal folds, which can cause tissue damage. Drink plenty of water to combat their drying effect. For example, for every mug of coffee you ingest, drink at least one 8 oz.
Some medications lead to dehydration of the vocal folds.
Antihistamines, taken for colds or allergies, shrink swollen membranes and reduce saliva and mucous production. These medications lessen the discomforts of the cold, but dry the vocal tissues. If you are taking medications that dehydrate, drink lots of water and other fluids. Try to keep home and working environments at a relative humidity of 40 percent or more. Repeatedly clearing the throat or coughing may damage vocal fold tissues.