Diseases that affect the memory...

Repressed Memory

Repressed Memory which is also known as ‘recovered memory’ is a hypothetical concept to describe a memory that is unable to retrieve/recall certain memories; these memories have been blocked because of a painful or traumatic event. Repressed memory is a term used to describe memories that have been dissociated from awareness.
Repressed memories can be recovered years even decades after the traumatic event, a trigger as small as a feeling or smell can restore the memory.
Traumatic memories are coded differently to ordinary event memories; they have alterations in the focusing attention span. Memories are seen as accurate but not in every case, some memories can be unreliable.
Memories of events are a mixture of factual traces and sensory information that are then overlaid with emotions, interpretations and imagination.
How reliable is the memory?

Amnesia
Amnesia is a partial or complete loss of memory that goes beyond forgetting. Often Amnesia temporarily only involves a certain part of a person’s experience. Amnesia can be brought on by an injury to the brain such as a bang to the head; it can also be brought on by a psychological trauma. A recovered memory is also known as dissociative amnesia which is a loss of significant personal information.

Alzheimer’s disease
Alzheimer’s disease is a common form of dementia, there is no cure for Alzheimer’s and it worsens as the disease progresses, it eventually leads to death. Most often Alzheimer’s is diagnosed in people over the age of 65, it is predicted that by 2050 Alzheimer’s will affect 1 in 85 people globally. There are common symptoms to predict Alzheimer’s, one being difficulty in remembering recent events. As the disease progresses and worsens symptoms include: confusion, mood swings, aggression and long-term memory loss.
On average the life expectancy following the diagnosis of the disease is approximately 7 years. There are no available treatments that stop or reverse its progression.
The person suffering from the disease relies heavily on others for a lot of assistance until the day they pass away.