What are the causes of confusion & memory loss?

Many causes. In aging adults, some degree of short term memory loss is not unusual while long term memory is preserved. However, confusion is a more worrisome symptom. Often the cause can be a medication such as a sedative or sleeping pill. Low blood pressure can lead to confusion also. If confusion persists, the family should see a doctor to see if the patient has alzheimer's disease.
Altered mental statu. Altered mental status may present as sudden cofusion or loss of memory, seizure when it happens it is followed b postictal cofusion without recalling the event, usually it is transient. Head concussion can cause cofusion and loss of memory and gradually this recovered by time, in older people, stroke can lead to altered mental status also.