Alzheimer's Disease (AD) is an irreversible, progressive neurodegenerative disease, characterized by cognitive impairment, memory loss and functional decline. Symptoms typically begin to first occur in patients in their mid-sixties, appearing in varying stages. The pathological features of AD comprise histopathological changes within the brain. Mild Cognitive Impairment (MCI) is a heterogeneous condition between normal cognition and dementia, whereby cognitive changes in mental abilities, such as memory or thinking, are affected. Almost all cases of AD begin with MCI, but it should be noted that not all patients with MCI go on to develop AD.