The demented patient is frequently delusional , especially early on when they can still formulate delusions. They easily become delusional and these delusions become fairly fixed. You sometimes see hallucinations , but these are not common. You can also have hallucinations when you are delirious, although they are also fairly rare. But, it is possible to have hallucinations in both dementia and delirium.
Demented people are very vulnerable to psychosocial stressors and to physical stressors .
They cannot adapt well. They can no longer respond appropriately to stress. All these things can cause dementing conditions. These conditions can be classified according to etiology. There is the primary idiopathic kind, which is Alzheimers and Picks.