Indistinct, hesitant or inarticulate speech. When a person has a tumor that affects the language centers on the left side of the brain, this can result in considerable disruption in the individual’s ability to articulate (or even think of) words. Such a difficulty is a definite symptom of such a tumor.

Broca’s area is the region of the cerebral cortex that controls motor functions in speech, and Wernick’s area controls an individual’s ability to comprehend language. When either of these areas is affected by a tumor, the person concerned might have trouble either speaking, or in understanding others, or often, trouble with both.