A behavioral symptom of Alzheimer's disease that encompasses getting upset, worried, and angry more easily. Acting depressed or not interested in things or hiding things or believing that other people are hiding things. It also causes to imagining things that aren't there etc.

https://www.nia.nih.gov/health/managing-personality-and-behavior-changes-alzheimers#:~:text=Common%20Changes%20in%20Personality%20and%20Behavior&text=Getting%20upset%2C%20worried%2C%20and%20angry,things%20that%20aren't%20there