Alzheimer's disease can cause a person to exhibit unusual and unpredictable behaviors that challenge caregivers, including severe mood swings, verbal or physical aggression, combativeness, repetition of words, and wandering. These behavioral changes can lead to frustration and tension, for both people with Alzheimer's and their caregivers. It is important to remember that the person is not acting this way on purpose, and to analyze probable causes and develop care adjustments.