how amnesia possible??

Anna,

Amnesia can result from damage to brain structures that form the limbic system, which controls your emotions and memories. These structures include the thalamus, which lies deep within the center of your brain, and the hippocampal formations, which are located within the temporal lobes of your brain.

An amnestic syndrome caused by brain injury or damage is known as neurological or organic amnesia. Possible causes of neurological amnesia include: Head injuries, such as those sustained in car accidents, can lead to confusion and problems remembering new information, especially in the early stages of recovery,but usually don't cause severe amnesia.

Another rare type of amnesia, called psychogenic or dissociative amnesia, stems from emotional shock or trauma, such as being the victim of a violent crime. In this disorder, a person may lose personal memories and autobiographical information, usually for just a brief time.)

Possible causes of amnesia include also:

Stroke;,Brain inflammation;,Lack of adequate oxygen in the brain;,Long-term alcohol abuse,;Tumors in areas of the brain that control memory; Degenerative brain diseases, such as Alzheimer's disease and other forms of dementia.Good luck & God Bless you Always......