People with brain tumors at the frontal lobe are likely to have personality changes because this part of the brain controls behavior and morality. The emotions we perceive and the decisions of what is good or not comes from this part of the brain. The tumor can affect this perception, making the individual have strong mood swings, become anxious, depressive, irritable or aggressive. It can even disable restrains on the person, making them to have behaviors that can be socially unacceptable and would not have normally. It can also bring to the affected the inability to identify emotions on other people and themselves.