Phenomena of memory loss associated with Alzheimer’s disease: 1. Memory loss, especially of recent events. Cannot remember what has happened, as if things have completely disappeared, even after reminders. 2. Loss of the ability to discriminate between the surroundings, such as not knowing the year, month, or day, not knowing the change of seasons, not knowing where you are, and sometimes not even being able to find your way home. 3.No trouble about memory loss, thinking is getting slower and slower, speech is getting poorer and reaction is slow. 4.No desire to seek medical help for the memory loss.