People with Alzheimer's disease typically show signs of memory loss, confusion, and impaired judgment. Some other symptoms include restlessness, mood swings, and an impaired ability to understand visual information. In most cases, the brain tissue of someone with Alzheimer's disease contains abnormal protein clumps and tangled bundles of fibers. However, the exact reasons why these abnormalities occur are still unknown. Though Alzheimer's disease is not a normal part of aging, a person becomes more likely to develop this condition as he or she gets older. In fact, the number of people with Alzheimer's disease doubles every 5 years after age 65. As of yet, there is no cure for the disease. There are, however, medications to help treat a person's symptoms.