Mood and personality changes
One of the most crushing signs of dementia in its advanced states is how it causes alterations in the personality and mood of the patients. It usually starts with mood swings and changes in interests. Patients become more susceptible to feeling anxious or depressed, and they may start having violent and unexpected changes in their state of mind. Then, in a late stage of the disease, patients become irritable and family members may report that it seems they are now talking with a completely different person. That is because dementia starts affecting the interconnection of neurons in the frontal lobe and other areas associated with personality.