Is anger common after a stroke involving the frontal lobe of the brain? and can it be a permanet

Stroke and mood: Yes! Frontal lobe strokes can cause personality and/or mood changes. The FLs when healthy act as our "filter", keep us from losing control of our emotions, help us maintain attention, among other things. Damage to certain frontal areas can cause difficulty controlling anger, tendency to be 'black and white' in your thinking, or even depression. Yes these can be permanent, but also can be treated..