Mood and anxiety problems are very common in neurological disease. Many patients have depressive symptoms or have trouble controlling their moods. Oftentimes, behavioral problems can occur, including agitation and aggression. Because of brain damage, patients’ personalities can change and they may not be able to control their impulses, leading to behavior that would have been unusual for them before. Psychotic symptoms can develop, such as hallucinations or delusions. Further, cognitive symptoms very commonly occur after neurological disease. Cognitive problems can include trouble with memory, attention, or the ability to do complex tasks such as take care of finances.