Similar to mood swings, personality changes deal with your mental health and, thus, are involve the brain. Glioblastoma invading your normal tissue can cause changes in your personality or behavior including confusion, delusions, or even hallucinations. Besides mood extremes and personality changes, do your close friends and family notice something different about you? If things around you just don’t seem the same for no apparent reason (like you just moved to a new neighborhood or got a new job) then maybe you should talk to your family doctor about personality changes.

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