Depends on the tumor
This really depends on where the tumor is located and the aggressiveness of the tumor (benign, malignant).
Tumors in the brain stem can affect a person's ability to hear, see, swallow, and breathe as they grow. Tumors in the cerebellum can affect balance among other things. Tumors in the cerebral cortex may cause seizures, mood changes
, motor deficits, and other various symptoms.