25 Signs and Symptoms of Alzheimer's Disease
Delusions and paranoia
Some people may go from seemingly irrational suspicions (say that someone else stole their glasses) to firmly held false beliefs or delusions (say that someone is trying to hurt or kill them).
Additionally, they may begin experiencing hallucinations or seeing, hearing, smelling, or tasting things that aren’t there.
A person may see the face of a former friend in a door or hear voices, for instance. According to experts, memory loss and the ensuing confusion associated with AD may cause the person to perceive things in new, unusual ways or become suspicious or misinterpret what he or she actually sees and hears.