Will a brain tumor ever cause halucinations?

Yes, a brain tumor can cause hallucinations. Hallucinations are perceptions that are not based in reality and can include seeing, hearing, smelling, or feeling things that are not there. Brain tumors can cause hallucinations by affecting the parts of the brain that are responsible for processing sensory information. For example, a tumor in the temporal lobe can cause auditory hallucinations, while a tumor in the occipital lobe can cause visual hallucinations. Brain tumors can also cause hallucinations by disrupting the balance of neurotransmitters in the brain. Neurotransmitters are chemicals that help nerve cells communicate with each other, and disruptions in neurotransmitter levels can lead to changes in perception.