Someone with an undiagnosed brain tumor could begin hallucinating or having delusions depending on the location and size of the tumor. Growths in the occipital lobe may cause visual hallucinations. Tumors affecting the frontal lobe may disrupt neurotransmitter levels and signaling between neurons, inducing delusional thinking. In some cases, removing early-stage, noncancerous brain tumors will eliminate these symptoms.

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