The causes of spitting out slurred words may be brain nerve damage, tongue tumor, tongue ligament shortening, etc., as follows: 1. Brain nerve damage: It may be a neurovascular lesion in the brain, resulting in damage to the brain nerve, resulting in restricted tongue movement, movement disorders, vocalization and spitting out slurred words. 2. 3.Short tongue ligament: Some children will have short tongue ligament at the age of 5-6 years old, and the most common clinical effect of short tongue ligament is that the tongue tip is M-shaped when extending the tongue, the tongue cannot be lifted up, and the words are not clear when speaking, and some l and e sounds cannot be pronounced. The lingual ligament lengthening is needed to restore the normal tongue movement and to conduct voice training to be able to speak clearly.