Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Memory loss or memory problems can be partial or total and is normal when it arises while aging. Sudden memory loss is usually a result of brain trauma and may be permanent or temporary. Brain trauma is not the only factor that can cause sudden memory loss as it may come as a side effect of statin drugs that are used as treatment for those who have hypercholesterolemia. Strokes are another major cause of sudden loss of memory. When it is caused by medical conditions such as Alzheimer, the memory loss is gradual and tends to be permanent. Long lasting and recurrent illnesses such as meningitis or epilepsy can also cause memory problems. Temporary or permanent memory problems can also be a result of chemical imbalances, exposure to toxic substances...