Memory loss can also be called amnesia, a condition in which a person has difficulty remembering facts or past experiences. People with memory loss can also experience difficulty in forming new memories. Memory loss (amnesia) is not only often associated with head bumps or accidents, but can also be caused by a variety of other conditions, such as disorders of the thyroid gland, to HIV disease, tuberculosis, and syphilis, which if not treated, can affect performance brain, including the center of memory. Various Causes of Memory Loss Head injuries are often a common cause of someone experiencing memory loss. Hard impact on the head that can cause short or long term memory loss. In addition, there are also several other causes of memory loss including: Alzheimer's disease Memory loss is a sign of this condition. Alzheimer's is the most common form of dementia, and usually attacks a person over the age of 65 years. Memory loss due to dementia in Alzheimer's dise